Good news! I bought a Mayflash adapter and two of these generic dirt cheap gc pads $20 AU for both (I am unable to load the link because I am a newbie). Works great. I'm about to order two more.
My only issue now is trying to load gc games from the main menu tiles of the Wii U. They are hit and miss. Some black screen after going Ng into vWii. Some hang at the nintendont loader screen. Ill load some more gc iso's to my SD card and load through the nintendont program rather than the main menu tiles.
Any sure tips for loading gc games on the Wii U?
I have the same issue when injecting gamecube games. It seems to be an issue that popped up in some of the latest builds of Nintendont. I managed to work around this by either using a forwarder to launch Nintendont by itself and then launch games from there. Alternatively, use an older build of Nintendont. The ones before the broadband adapter feature got merged into the main branch don't seem to have this issue.