Gameboy(Colour/Advance) is rendered per pixel/line, you cannot replace them with...
Custom graphics/option to dump sprites and backgrounds
Try Higan, i believe it uses the same GB_APU as us.
Try a version prior to R 1170
um? what? we don't have a Chrome OS version.
Apart from the cheat creation and turbo/throttle issues (which are on the todo list)...