Out of curiosity, how long are you expecting this to take? I haven't bough my Dingoo yet, I was going to buy one for myself as a present when I finish at uni, but depending on when this might come out, I'm tempted to hold off until then. I saw you said you wanted to make it a reality in a short time, but when talking manufacturing/development, I appreciate that a short time is more than a couple of months!
Also, will you be keeping the TV out? That was one of the big draws of the Dingoo for me, beyond the plain emulation. Oh, and if you've got a faster processor, do you think some of the SNES games that don't currently work on Dingoo (Pilot Wings, Mario Kart, Yoshi's Island, Starfox) might be feasible?
Anyway, good luck with this, it sounds like an excellent idea.