I agree with Emperor Constantine that the most likely chance is after the Napoleonic wars. The thing is that taking Corsica off France doesn't really make a lot of difference for France; Corsica was never an important naval base, or a settler's colony, or good land for intensive agriculture. So taking Corsica away won't punish or cripple France significantly.
For the same reasons, I can't see a lot of interest in other states to acquire it, save for Britain, and even the Brits didn't push that hard; and I guess mostly to complete the set in the Mediterranean. If they do get Corsica I can't see them giving it away, it's so much larger and closer than the Ionian islands. And to whom? Greece was a loyal ally, but Britain doesn't have a close ally in Italy.
Off the top of my head, I can think of a couple of possible plans: Corsica could get independent before Napoleon, then join a united Italian state, or be invaded by them; or a minor Italian state could be given Corsica for some reason - maybe Tuscany. Giving it to Piedmont-Sardinia makes sense in abstract, but it didn't happen in OTL - was it ever considered? Maybe if they perform much better against Napoleon?