What about this sceniario?:
>POD
>High tension between the Court and the Hungarian government.
>1849, a compromise is reached (similar to OTL 1867).
>1853-'56, Crimean War is like OTL.
>1859, 2nd Italian War of Independence ends with Habsburg victory.
>Status Quo Ante Bellum
>1864, 2nd Schleswig War, no changes.
>1866, Habsburg-Prussian war, Habsburg victory.
> Rheinland, Westphalia, Schweslig, Silesia to Habsburg; Pre-Congress Saxony restored.
>Bismarck is forced to resign. Wilhelm I abdicates.
>German Confederation is strengthened.
>France is greatly concerned with the Austrian advancements.
>1870-1872, Habsburg-French War.
>War is reignited in Italy too.
>War ends with Habsburg victory.
>France loses Corsica, but is compensated with Savoy and Nice.
>House of Savoy loses Savoy, Nice, Piedmont and Liguria, but is compensated with Corsica
>Tuscanian Habsburgs gain Piedmont and Liguria
>German Empire is proclaimed
>FJ passes the Hungarian crown to his younger brother, Maximilian.
>Galicia and Dalmatia are ceded to Hungary.
>FJ cedes Lombard-Veneto to the Tuscanian Habsburg branch
>Kingdom of Italy is proclaimed by Tuscanians, despite not even uniting Northern Italy entirely.
>Modena is transferred to Kgdm. of Italy, Habsburg-Este branch is compensated with Westphalia.
>Kgdm. of Italy wages war against the Papal-Parmese-Sicilian-Sardinian Alliance and wins.
>Italy is united
As you can see, it's just a very raw and vague idea of mine. Feel free to criticise, enhance, modify, suggest, argue, etc.!