Every modern slot1 already supports NoPass, so you can run any NDS game from a slot2 already. Why you still want to run a NDS game from a slot2 is kinda pointless since slot2 loading of NDS games was there because there was little to none slot1 flashcarts that could run NDS commercial games at that time.
Otherwise your just inquiring into an area that has been a dead end for awhile now.