In the RGB pinout posted, the pins for RGB correspond to pins 7, 9, and 11 on the pinout in the wiki. With 8-10 jumpered, they are Y, Pb, and Pr, and with 8-10 not jumpered, we have Y, unknown, and C...so no, this wouldn't work on American Wii consoles. It appears the earlier mentions of trading off SVideo for RGB like the GameCube were correct.