that probably would not work for several reasons. 1st of all, for several centuries before its annexation, Bulgaria, particularly Eastern Bulgaria, was systematically depopulated in the Roman-Bulgarian wars that raged throughout the 14th and early 15th centuries, and its population was not numerous to begin with. the 15th century killed approximately 4,000,000 Muslim Egyptians before the great revolt, and they still had the numbers to wear down the copts into recognition of their independence. that is how large populations in the Levant are compared to the Balkans. secondly, Bulgaria already was dominated by the Orthodox faith, and lived culturally in the shadow of Rome. The OP has stated on numerous occasions that he does not think mass romanization of the Arabs will be successful because there are simply too numerous, and have a highly developed literate culture independent of the Greek world. Thirdly, if I remember correctly, Demetrios I or possibly Theodoros split Bulgaria into 2 principalities, and then subjected them to the beginning stages of hellenization. by this point, it has been at least partially culturally subsumed for over 150 years, not even counting their formerly close cultural orbit around Constantinople. additionally, I believe Andreas encouraged emigration into Bulgaria by cultural Greeks, although not to the same extent he did with southern Italy. he only acquired the Levant in the last 15 years of his reign, and all progress he was made was literally killed off by the resurgent "Abbasid" caliphate. after the time of troubles was concluded, the heartland did not have access immigrants to send into the Levant, and by the time it had recovered (although by no means did it have a surplus of population) the Levant had demographically recovered from the time of troubles. romanization efforts generally successful in absorbing much of the holy land, but the Arabs were too numerous for those to become a majority. finally, in Bulgaria, notwithstanding the early destruction of tyrnovo, the Romans used to their standard carrot and stick approach towards assimilation. In the Levant, for entirely justifiable and understandable reasons, they have almost entirely relied on the stick, and it cannot produce the lasting results of the carrot.
