I use the 8bitdo ultimate controller. It is super programmable, the analogue triggers work with dolphin, and it has a nice dock. It has Bluetooth and a 2.4 GHz dongle. 8bitdo also makes a wireless gamecube adapter that connects to an original GC controller. Although I haven’t tested it and it doesn’t mention Linux compatibility

This article talks about turning a laptop into a rack mounted computer. Each computer will be different recreating something like this based off what ports it has and where.