Everything can be negotiated if countries are willing to do so, depending what one would gain from the other by giving something to each other, so yes, if Greece wanted, they could on some islands close to Turkey can just claim 12 nm as territorial waters and claim EEZ on the others, just to give Turkey more sea area and to be “neighbourly”, and I wouldn’t be surprised if these discussions do take place between Greece and Turkey. The question is, what does Greece want back in return? Perhaps for Turkey to withdraw from Cyprus would be my best guess, but I don’t see any deals coming to fruition.
France and UK have some understanding to the best of my knowledge over the Guernsey & Jersey islands.
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