A bit of both. I recently did some digging on Assyrian/Aramean/Syriac culture here to see what provinces, in game, that it could inhabit (Not many, by 1444 Timur had all but slaughtered them in the major cities and driven them into the rural highlands) and I found out that linguistically Assyrian/Aramean/Syriac (whatever you call it) is very similar to Arabic. The overarching similarity for the Levantine culture group is most of them (except Turkish) shared a Semetic language. If there was to be a culture rework, I would move Turkish into the Altaic culture group and give them an accepted culture bonus in their traditions, with an event later to culturally integrate into the Arabic culture group, at which point they would transition to the Levantine culture group.
I'd have Trebizond have two routes for a mission tree. One leads to reforming/usurping Byzantium/the imperial throne, while another leads to tall Pontus run.
Actually, PDX could do their own flag. While this is the flag from 1919 Pontic committee to the Versailles and Sevres treaties, the idea of the flag is the
Pontic eagle with sometype of colored background. That being said, this flag is the currently recognized flag of the Pontic community.