"In fact, that was probably the only element you could pressure Turkey with."
I never thought for a minute that the EU process was a leverage factor allowing the RoC to pressure Turkey. On the other hand pressure can be applied in other ways, as the S300 affair proves. Except that the S300 are a bit of a mystery to this very day for other reasons.
A progressive, wealthy, RoC with a 72 mile frontier with the Turkish army, is pretty close to what Ecevit had described as a nightmare for Turkey- a Greek military presence in the Middle East, and that is enough pressure to solve the problem and it can be more effective than the threat of a veto in the EU.
If you put down lists of options for both sides to this problem, the Greek list is longer, odd as this might sound.