I've been pondering ways to have a greater Italy during the 19th Century, and so far haven't been able to come up with much. The idea is to create an Italy with as much overseas influence by the end of the 19th Century as France did in OTL, which is hard because France had a major headstart given that it has existed as a unified state far longer than Italy.
My initial thoughts were to create some kind of pan-Italian identity born out of Napoleanic-styled nationalism - that is to say, after the end of the Napoleanic Wars, have an Italian state form that maybe excludes the Austrian lands and the Papal States until a later date.
Any other ideas?