The Albanians of Southeastern Italy are descended from medieval migrants, read https://en.wikipedia.org/wiki/Arbëreshë_people.
Yes. If anything, the Fascists would downplay the Albanian culture in Italy to folklore levels, and insist on teaching Italian in Albanian primary schools on the other side of the sea.
As to the idea that Albanians can be Italianized, I doubt that. They might be convinced not to object too much to Italian domination, if their economic situation improves, which is a possibility with this ATL postwar. It is the Italians that, after a decade or two, might decide that Albania is a net loss and not worth the prestige of owning it.