Mad Catz 7" Universal Game Screen (Score 1)

Mad Catz has a 7" screen that connects to a S-Video or composite video output. It's designed to fit a PS2, GameCube, or XBox, but you could probably modify the bracket to fit on your system. It's not cheap at US$199, but it might be what you're looking for.

http://www.madcatz.com/MadCatz/product_details.jsp ?product_id=6080