AHC: Roman Catholic, Romance-speaking Greece

As the title says. With a PoD after 1444, how could you make Greece a Romance-speaking, Roman Catholic country? I was thinking that maybe Venice could conquest what consists of OTL's Greece.
 
Part of Greece, as Archipelago or coastal regions, is possible at least for religion. It happened IOTL under Latin occupation and administration.

Whole Greece, however, even if Venice could have conquered all of it, would be close to impossible : religious (in a region that rejected Roman Catholicism with all the energy it got), administrativly, and in matter of prestige, it was simply too great, and the benefit in imposing a romance language would be too unimportant to go trough all this sort of troubles.
 
As the title says. With a PoD after 1444, how could you make Greece a Romance-speaking, Roman Catholic country? I was thinking that maybe Venice could conquest what consists of OTL's Greece.

Probably need a massive depopulation of Greece. This could happen if, say, the Despotate of Morea collapses into warring city-states, which requires only a bit more incompetence on the part of Demetrios and Thomas, and the Ottomans have to reduce city after city in order to get their way.

Then it's a question of the remaining islands submitting to the Pope and Venice for protection, get culturally assimilated, and perhaps with a bit of luck Venice can take back the Peloponnese that way. Difficult and probably requires a persistently lucky Venice, but not totally impossible.
 
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