Just something that passed through my mind. Something like
THIS could help facilitate a C64 portable prdject, no? It takes composite video and RCA audio in and only used ~7W @ 12V I could see gutting this and mounting it internally in a C64 case, mounting the LCD hinges to the C64 case. The LCD itself would have to be flipped so the image woulnd't be upside down. Even if not for portable, it could be neet for desktop.
Just a thought.