A YouTube video has been released showing a user booting the Wii similar to the way SaveMii Dongle does using a GameCube Controller. You will need to take the GameCube Controller apart to reveal the connections under the plastic D-PAD (The plastic D-PAD part will not let you press all the buttons at the same time). After you take the Game Cube Controller apart remove the plastic D-PAD cover and press Up+Down+Right+Left at the same time during the Wii boot up. Use this guide HERE to help determine what steps to take to recover the Wii using this method. I have not tried this but there have been confirmed users that say it does work. HERE is the link to the video.