So yeah, after looking up how to do AVR inline assembly in arduino c++, looking at instruction sets, reverse-engineering existing programs to know how to communicate with the screen and porting axe's 4lvl grayscale routine i managed to port it to Gamebuino!
I'll release source once I'll get some things cleaned up.
For those who don't know what this is: This is basically an arduino with one of those nokia 84*48px monochrome screens
