[quote=@Wilted Rose]
You could probably give Italy something like Austria's diplomatic marriage, or maybe something like "Giuseppe Garibaldi's Legacy" where they get a Combat Bonus against invaders.
[/quote]

If anything, it'll likely be some form of the latter, as diplomatic marriage was already given to Brazil and Britain (as I have decided only recently). It may end up just being little to no maintenance on units, or higher great general rates.