Physical keyboard on a Flip Phone Android

I have a Sharp SH-N01 Aquos from Japan. Its a very nice little phone with Android and 4G, but the only thing I cannot use for the life of me is a different keyboard so I can type in my native language (I'm Greek). I can only type Greek with the touchpad mouse that the phone uses, but not with the physical keyboard.

The stock keyboard app works very well with English and Japanese. Any suggestions?

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