Here's a map from a timeline idea I've been toying with. Its basically where Napoleon dies at Leipzig, and as a result there's no Hundred Days Campaign. Napoleon had managed to gain the upper hand in the battle and rode out to boost morale among his troops when he was hit by enemy fire. As a result of his death, the Army lost coalition and France's Empire came apart at the seams. A few loyalists tried crown Napoleon II as the new Emperor, but once the Coalition forces marched on Paris, Marie-Louise fled with her son to the Austrian Court. The Bourbons were restored with France keeping its pre-Revolution borders. France is in a much stronger position without the Hundred Days with the resources of the bits of the Rhineland it had, and the lack of a War Indemnity levied upon it after Napoleon's Hundred Days Campaign of OTL.
Napoleon II basically grows up in the Austrian Court but is fond of his father's legacy and resolves to have a career in the army. He also takes a deep interest in his education and tries to learn military strategy from whatever books he can. Napoleon grows bitter from the gilded cage that Austria has trapped him in, and develops a personal resentment towards Metternich. Napoleon manages to earn his grandfather's sympathy, and gains command of a battalion in Tyrol. The revolts against King Charles X of France occur like in otl but this time its a full blown Revolution. Though Bonapartist support among the old Napoleonic veterans and some segments of the French population is high after Napoleon's death in battle rather than him being defeated, and placed in exile. The Revolution of 1830 causes both the Bourbons and the Orleans family to flee. The liberals and moderates now have no one to rally to, and a self proclaimed Second Republic is declared in Paris. Though not everyone supports this as it brings back memories of the chaos and anarchy of the First Republic. Napoleon II arrives in France and the army defects to him en masse. He presents himself as a candidate restoring order in France. Napoleon then marches on Paris which is held by the unpopular Second Republic and easily takes the city. The Austrians reluctantly back him as he's Emperor Francis's Grandson. Napoleon then declares that he wishes to uphold the peace in Europe in order to assuage the fears of the rest of Europe.
Napoleon then reinstates old Napoleonic War veterans and rules France as a strong colonial power. As a result of the butterflies, Brazil doesn't declare independence and the Portuguese Empire is reformed into the Portuguese Imperial Commonwealth. Spain is able to crush the revolts in Latin America, as a result of this it retains shaky control of its possessions with various juntas in de-facto control in the name of Spain's King. The Carlist Wars begin in schedule as a result of Don Carlos wanting a more traditional Spain with regional autonomy of the other provinces restored. The more liberal faction supports Isabella and the colonies are largely in favor of Don Carlos. Napoleon II who was influenced by Austria's conservative and idea of the old Monarchical system, is worried about the liberal Constitution of Spain, and quietly supports the Carlists. While not officially entering the War, France does send "volunteers" and provides materials and weapons to the Carlists helping Don Carlos take the throne as Carlos V. Isabella II flees to Portugal which is ruled by King Pedro IV (OTL's Emperor Pedro I of Brazil). Both Brazil and Portugal are hostile to Spain while France gains a new ally and partner leading to a warming of relations between France and Spain.
Napoleon basically promotes industrialization and social reforms for the poor and working class, using popular support as a powerbase for his rule. In the 18 year build up France industrializes and slowly rebuilds its Grand Armee under Napoleon II. Napoleon hands command to Davout (he doesn't die early like in otl). Napoleon is a protege of Davout and learns from him and some of the older Napoleonic veterans, about military tactics and strategy, making him a skilled commander. Napoleon's armies are sent overseas to look for newer colonial possessions which helps France gain prestige as a military power and empire again.
In 1848 both Italy and Hungary start to revolt against the Austrians. Napoleon hesitates from attacking Austria as its ruled by his family. But once the Roman Republic is proclaimed, and the pope is ousted, Napoleon is forced to take action where he sends in the army to restore the Pope. The Kingdom of Sardinia-Piedmont who's attacking Papal territories is excommunicated by the Pope. They're also decisively defeated by the Austrian army commanded by Marshal Joseph von Radetzky. Though the Hungarian Revolts force the Austrian to try and crush the revolt before it got out of hand. Napoleon II is also given his old title as King of Rome by the Pope who crowns him with the Iron Crown of Lombardy. Napoleon then crushes Sardidnia-Piedmont, and annexes its lands into France after it resists the Grand Armee in its attempts to reach Central Italy. Napoleon then takes advantage of the revolts in Sicily and marches into the Kingdom of Two Sicilies. He promises land reform to the peasantry wins them over. Italy is basically united under a Confederation with the political head being Napoleon II as its Sovereign while its Spiritually led by the Pope. The Confederation consists of Napoleon's Kingdom of Rome, The Papal States, the Kingdom of Naples, and Kingdom of Sicily. He installs his cousin by Joseph Bonaparte as its Kings rather than the House of Murat (Joachim Murat betrayed Napoleon).
With Austria in flames, Napoleon arranges a deal with Franz-Ferdinand via his mother Sophie of Bavaria who Napoleon was close to. Napoleon intervenes on behalf of Austria and moves to crush the Hungarian revolt. Napoleon also makes Austria agree to an alliance and a series of economic agreements tying their economies together and opening new markets to French businesses. While saving Austria, this leaves the Empire on shaky ground and dependent on France to prop it up. Though later on with French backing, Austria is able to federalize.
In the Netherlands, France provokes a revolt among the Walloons. This allows him to annex the Rhineland and restore the Kingdom of Holland under Louis-Napoleon (otl's Napoleon III). This leaves Britain paranoid without much room to maneuver. Napoleon knowing that war will come soon if he tries to expand, instead pivots to colonial affairs in Africa and Asia. Germany unites in the Frankfurt Convention under Prussia which freaks out Napoleon much to the delight of Britain who supports it as a counterweight to France. Napoleon signs a secret agreement with Austria, Saxony, and Bavaria forming a military pact in the event of a war with Germany. In the 1870's war with Germany is declared, and Napoleon with the aid of his German allies manages to utterly crush the Prussians with him marching on Berlin where he restores the Confederation of the Rhine. Prussia is dismantled with Silesia returned to Austria, Saxony given back its lands, and Pomerania being made into a separate Duchy. Prussia is essentially reduced to the Grand Duchy of Brandenburg though they still rule East Prussia.
Russia is largely distracted from European affairs with an even worse Polish uprising of 1830 which forces the Russians to stay out of European affairs. Russia however joins on behalf of Germany, fearing another Bonaparted dominated Europe. Napoleon then announces his intent to liberate the Poles prompting another uprising. Napoleon also makes arrangements with Sweden and Denmark to ally with him against Russia. Sweden returns Norway to Denmark in exchange for all of Karelia and control over Estonia and Latvia. With Russia crushed and humiliated, the Grand Duchy of Warsaw is restored with the borders of Poland-Lithuania.
In the 1880's Napoleon then launches an invasion of the Ottoman Empire with his European allies and this allows him to partition it. He creates a Federal Kingdom of Yugoslavia with a Habsburg monarch while creating a Kingdom of the Vlachs (uniting Moldova and Wallachia) under a Bonaparte as its King. Greece and Bulgaria are united in a new Empire of Rhomania (Neo-Byzantine Empire). Napoleon II who was a philhelline has ambitions to restore this empire. Napoleon gives the Western parts of Anatolia to this new Empire with its Greek population while an independent Kingdom of Cilicia is also created. The Ottoman Empire is left as a rump state in Central Anatolia. Armenia and Georgia are united in a large Kingdom with the Bagrattions restored to its throne.
What do you guys think about this map, and synopsis for a timeline? I plan on writing a Napoleon II timeline sometime in mid 2020.