So Nintendont was updated to support the GC adapter for Wii U

GC Controller Adapter for Wii/Wii U ( Edition) for Nintendo Wii, Wii U

GC adapter support · Issue #666 · FIX94/Nintendont · GitHub

WHOA! GameCube Adapter Works on Nintendo Switch! - We Show it Off!

gamecube Controller Adapter (For Switch/WiiU/PC) – YCCTEAM

vwii using nintendont/usb loder gx with gamecube controller adapter?

raphnet. - N64 controller to Wii/Gamecube adapter (v2)

4 Port GameCube Controller Adapter for Nintendo Switch Wii U PC Super Smash Bros

FainWan Compatible with Nin-tendo Gameboy Advance to Gamecube Link Cable Game Boy Advance Adapter New : Video Games

Wireless GC controller options for Nintendont? - The Independent Video Game Community

So Nintendont was updated to support the GC adapter for Wii U. This is now possible. : r/wiiu

Controllers Compatible with Nintendont : r/WiiUHacks

GameCube controllers now compatible with Switch via Mayflash GC Adapter!

Can you use the gamecube adapter for wii games that support gc, like mario kart wii? : r/wiiu

Can someone please help me work a third party GC adapter with nintendont