I think porting maemo 5 all by yourself to whatever device has the screen you want is easier.

Seriously, I'm no expert but to my knowledge there is a specific lcd controller on board, and those are not standard. Also the touchscreen controller present is meant to read resistive touchscreens. And the technologies being different I don't think the controller would support your new screen. So all in all I think the answer is a NO unless you can rebuild the motherboard from scratch.