Your challenge, should you chose to accept it, is to end up with a Turkish state clearly centered on the Balkans after 1900. It may retain territories in Asia, but these should very clearly be less important economically and demographically than the ones in Europe. It may still be called an Ottoman Empire, but Turks should be at least a plurality. No cheating with a Communist Turkey or puppetized Turkey in Anatolia. While Turkish-majority areas there may remain under the control of other states, there should be no other Turkish entity other than the one centered on Europe.
Hard mode: at the same time, shift the center of gravity of Greece outside Europe. To Smyrna and Cyprus, perhaps.
The PoD should be no earlier than 1815. The later, the better.
Hard mode: at the same time, shift the center of gravity of Greece outside Europe. To Smyrna and Cyprus, perhaps.
The PoD should be no earlier than 1815. The later, the better.