With a POD no earlier than 1923, make Turkey into a stable "first world" country with a GDP and standard of living comparable to Western Europe. In this TL, Turkey should be considered a European country and have a HDI larger than Greece's. Turkey should be a multi-party, liberal democracy and ethnic conflict with the Kurds should be either very small-scale or non-existant. Turkey may or may not be a member of the EU but must meet the requirements for an EU member state.
Good luck!
Good luck!