WI: Angevin Kingdom of Albania persists/remains joined to Naples?

I read recently about Charles I d'Anjou's exploits across the Adriatic, including his conquest of medieval Albania and proclamation of himself as its king. This kingdom would last from 1272 to 1368, although it was seriously reduced in size during the 1280s-1290s by the Byzantines and Serbs.

First of all, what would it take to maintain Angevin-Neapolitan control over not only the Albanian coast, but also its interior? Holding on to Berat against Byzantine incursions is the first thing that comes to mind, although the Sicilian Vespers will also probably need to be butterflied (or at least made less severe).
Secondly, what would the long-term effects be? I know the Latin Empire ended in 1261, but would this trans-Adriatic state help to re-claim it and/or prop it back up again until its internal affairs stabilize and the Constantinopolitan patriarchy reaches a compromise with the Western Church? Would the modern Albanian language drift towards traditional Romance languages? Would such a state serve to strengthen or weaken Albania if and when the Ottomans or their counterpart roll around?
 
I think the easiest scenario for a sicilian Albania would actually be placed earlier -- have Alexios Komnenos not manage to take the throne after Manzikert and you have a still-unstable Byzantine Empire ripe for exploiting.
Now, i'm less knowing on the question of 13th century Albania, but i think just having a stronger Latin Empire would be effective. That, or weakening/dividing the Epirus Despotate, which is most probably the elephant in the room here.
 
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