I use a BlueRetro for GameCube that connects 4 GameCube controller plugs into the Wii/Gamecube and assigns 4 bluetooth devices to each. I use it for a 8BitDo Arcade Stick to play SHMUPs in the WII (Arcade, Snes, NeoGeo, PSX, etc..)
It never turns off because it is a GameCube port, wired to...