Here are two articles from hackaday that are covering similar territory, either might be helpful for creating a solution:
The first uses a micro-controller to interface between an N64 and a wireless 360 adapter for the PC
https://hackaday.com/2018/07/31/add-on-board-brings-xbox-360-controllers-to-n64/
The second article has more to do with creating wireless controllers out of refurbished retro controllers. Personally, if I could mod my Duke and my S to work wirelessly with my OGBox, that would be my preferred solution as it would preserve the original "feel" of the console. But I would ABSOLUTELY take a 360 controller over my current mess of wires.
https://hackaday.com/2012/02/13/wireless-controllers-for-all-your-retro-systems/