Hi Nikos,
sorry, for the belated reply.
I have tried to contact both Apple in Greece and one of the biggest banks in Greece (Piraeus Bank).
Unfortunately, when it comes to Apple mobiles in Greece, the official representatives of them are the local mobile providers (Vodafone, Cosmote and Wind...). When I talked with someone from Vodafone, they said they have no idea when Apple Pay is going to be available and they could not assure me that they will escalate this request. In fact, they said that it is possible that the non-availability of Apple Pay in Greece could be explained due to the fact that "people in Greece don't really use electronic payments (cards etc)"... smh 😕 We all know that this is not true at all...
Piraeus Bank said that Apple refused to collaborate with them for PB's, related to Apple Pay, mobile application, which is available on Android. This was expected of course, due to the policy of Apple, that has decided to have their NFC closed. Then, I asked them if they can escalate my request and they said they will, but they also said that they can not let me know more details about it, like getting updates of how the whole process is going with them and Apple.
This of course means I will never know if someone from both parties actually tries to make Apple Pay in Greece available..
Cheers,
Antonis
P.S. I already have sent feedback to Apple about this. Not sure if it is actually "working".