Retro Fighters has really cool stuff. Their
NGC Pro controller also has, Dolphin supported, analog triggers. I think is a good controller, the d-pad is huge and responsive, the analogs gets the job done.
The one for the
N64 is also pretty comfortable but I still think the OG analog is more precise.
Edit: If you want to use official things, Nintendo NSO N64 controller is BT and works on Windows. I could configure it over retroarch without much problems.
I'm pretty confident that the Gamecube one that will release alongside Switch 2 also works on Windows!
If wired isn't a problem for you, the Wii U for NGC adapter actually works on Dolphin. Supports even the bongos.