Dude this is awesome. Would love a TL about this POD.Some alternate ideologies from a world where 1848 was a success for most of the people involved:
A middle ground between civic and ethnic nationalism, and somewhat of a 19th century version of OTL left wing nationalism, societal nationalism was born out of the left wing of the romantic nationalist movement. The main difference between ATL societal nationalism and OTL romantic nationalism, is that societal nationalism views the nation as being made up of several closely related yet diverse and varied peoples, each one of them having been shaped by history in a form suitable to their own corner of the land - therefore, this diversity and variety should be protected, rather than erased.
Societal nationalism, in this alternate 19th century, was most popular in those countries that made up the Mazzini-led Young Europe alliance, even though Mazzini himself was ambivalent at best towards it; indeed, it was born not as a coherent ideology, but - just like most things in Italy at the time - as an ad hoc compromise between the various drivers of Italy's unification process, facilitated by Maria Antonia Cattaneo. 
 ATL daughter of Carlo Cattaneo and his OTL partner, Anna Woodcock; she closely followed her father's footsteps in education and philosophy and, while her gender prevented her from serving in the Italian government in any capacity, she nonetheless acquired a reputation as philosopher and writer rivaling, if not surpassing, that of her father.
Yet another ad hoc ideology born out a compromise, this time between the advocates of colonialism and those who wanted no part in it, Promethean colonialism is an exercise in altruism and selflessness as justified and motivated by cold, hard realpolitik: in the first decades of its existence, the Young Europe block had made a lot of enemies, due to having been forged out of the corpses of the Habsburg and Romanov realms, and those enemies were about to go commit human rights abuses elsewhere in the world for fun and profit.
Profit that would've surely been used against Young Europe, so what's a fledgling alliance to do, especially when a sizeable part of it doesn't want anything to do with colonialism? Give fire to humanity, so to speak - that is, build up select African and Asian countries against the coming menace through medicine, weaponry and so on, in much the same way the OTL Soviet Union went on and on about anti-imperialism. Just like with Soviet crypto-imperialism, local leaders were encouraged to adhere to the aforementioned societal nationalist ideology in order to get what they wanted, with the relatively inclusive nature of it giving birth to several dozen versions of societal nationalist thought in Africa and Asia.
Promethean colonialism could and did fall into some of the same traps of OTL communism and imperialism, and it eventually provided the casus belli for the Great War, but its success stories provided Young Europe with a set of allies not to be trifled with, leading to the defeat of the Old Monarchies.