Here are a collection of open-source hex files.

https://gbatemp.net/download/openwii-fi ... scs.38115/
https://gbatemp.net/download/chiip-v0-9-1.37703/
https://gbatemp.net/download/wiiskas-beta-1c.37580/
https://gbatemp.net/download/yaosm-3-2-firmware.37137/

A classic controller works too, but only if the Wiimote is present. Remember the good ol trick of lighting tea candles to work as a sensor bar?

https://gbatemp.net/download/d2lite-v1- ... isc.37564/
https://gbatemp.net/download/wiikey-2-v ... isc.37562/

The D2lite firmware can be cross-flashed onto a WiiKey 2 if it has a yellow sticker on the back, as they're essentially the same chip.

Kinda strange how they slapped an unrelated CD logo on their discs, especially since the GC only reads DVD media.

Apologies to bump. But with the right media and adjusting the laser of your GC, everything should work as planned.