Hi and welcome to our forums Bouras!
Yeah we know about Greek Army and believe me when I say this that we'd just love to have as many armies as possible in FH2 to bring out the always forgotten participants of the second world war but we have two BIG problems which always stops us on our tracks and these are:
1) Voices. As you've noticed, FH2 uses the BF42/FH0.7 voice sets which unfortunately does not include the greece voices. This is a huge stopper since a nation is nothing without their own voices. Unless we get someone who can provide good quality voices for the greeks, then theres no future.
2) Player models. They are always the most time consuming and hardest bit when theres need for new army. This is why we dont have Airborne, Fallschrimjägers, Gebirgsjägers and such just yet. Hopefully we'll get them later.
But its always a nice suggestion and while theres not much to say to it, I just wish you welcome to our forums and fair community.