I am not worried about the language question in Greece. As you say I also have the impression that the CGI in Egnatia is english. Also at Alfa (
Alfa Aviation Academy, Pilot Training in Thessaloniki - Greece ) I see a very international crew with only english as common language. This is the schools that is most interesting for me as they are located in north of Greece (Kavalla and Thessaloniki) So this is not one of my concerns.
More if someone has been in contact/studies there to share thoughts and fears, always good to hear a second point of view.