Thanks for the replies. I managed to get the system menu to run with 252 and it worked. Press the PS button and the cursor appears) (the right stick only had a small bounding box for cursor though, it couldn't reach the home button top right)
I played around with something called CustomiseMii to try and change the ios that Retroarch boots with.
I had to mod a WAD to run on 252 that installs a channel that points to Retroarch.
It worked. I was able to bind the controls in the settings of Retroarch, the only problem being the neither of triggers on the right side worked.
I need to do more testing, there were a few hard lockups/crashes.
@XFlak Will this ever be able to be added to the usual ios58? How big can an IOS be, is it a size limit that stops plugins being added to the Wii ios'
How do you sniff out the ds3/hid key presses on your end? I ask because I have an old self built USB stick that uses the original ps3/hid Cthulhu control board, where pressing two buttons emulates the PS button. (when i plugged that , it causes hard locks)
@xerpi I thank you for your hard work on tinkering with this. I honestly think creating an HID compatible plugin would create a whole new lease of life for people wanting arcade action using a Wii, a CRT and USB based peripherals.