First of all, I want to give my congratulation to the staff. The map is great.
I can inform you about the Greek fighters and bombers only.
There are many, but most of them if not all they are not in AH list. Main types that served with Royal Hellenic Air Force during the Italian invasion in Greece (28 October 1940) and during the operation Marita (German invasion in Greece 6 April 1941) until the end of campaign in Crete (May 1941) are:
PZL 24, Gloster Gladiator, Dornier 22, Marcel Block MB 151, Potez 633, Henschel Hs 126, Bristol Blenheim.
Here is a link that will you a general idea
http://en.wikipedia.org/wiki/List_of_historic_aircraft_of_the_Hellenic_Air_ForceAs it concern the AvA in place of PZL 24 the I-16 looks as a fine compromise to me. Maybe the CM staff should consider the possibility to enable the I-16.