So far @Sārthākā seems to be moving toward the ideas of Dragoumis Eastern federation. Which do make a genuinely good relationship possible, after all the empire still has more Greeks than Greece (about ~1.5 million in Anatolia, ~2 million in Europe when Greece post union with Crete is about ~3 million) and said Greeks form an inordinate part of the middle class. Of course this means full equality as opposed to young Turk nationalism for real... and Greece should and will maintain naval parity, it must have a stick around lest the politics suddenly switch again in Constantinople or for that matter to make sure the porte understands it has a lot to gain from Athens friendship and much to lose otherwise. And yes I'm instinctively suspicious till proven hopefully wrong.I just found this TL and it is already one of my favourites. I'm Greek heritage and I've always wanted to see a TL that has a rapprochement between Greece and Turkey/Ottomans. It is a tragedy that in OTL they have been so hostile to each other that it has harmed both of them.
Turkey/Ottomans will benefit immensely from the merchant marine/trading contacts of Greece while Greece will benefit from being friendly to the largest power in the region. Greek tourism and industry can be only benefit from a friendly relationship between the two powers while a friendly Greece allows the Ottomans to have a thriving and peaceful Aegean.
I am eagerly looking forward to how this TL develops