Albania's state religion should be Catholic and not Orthodox, because I remembered they were in the Crusades. At least the 3rd one, the one with Richard the Lionhearted.
Oh and Byzantium shouldn't get turkish culture just because the culture of the government means this is the type of culture the government is. Not who that government likes. If that was true then England should get German culture or France getting Huron culture lol. Greek, Slavonic, and Italian make good sense with me. Though Romanian would be fine being the culture isn't a far cry from Italian/Slavonic. Turkish I would think would be right out, unless there was an ahistorical event that added turkish by sometype of reUnion of the peoples like when Byzantium conquers most of Turkey/at such and such date (give it awhile that way you could have events of turkish uprising and maybe a civil war) and trys to ammend the relations between the greek and turkish people by giving the turks more power in the government. You could have some council and maybe two provinces convert to the state religion, worsen relations with islamic nations(like they wouldn't be bad enough already lol) , and stabilty go up 2 points or something like that.