I've finished compiling and updating the Xbox Wireless Adapter Driver (xow) to work on MiSTer.
Here is the repository: https://github.com/MiSTer-devel/xow_MiSTer
For now it requires manual installation and there are installation instructions on the github page. After I receive some feedback it will be added to the official MiSTer update script. (thanks Locutus73!)
This driver should support all Xbox One and Xbox Series controllers but you might need to update the controller firmware (using the Xbox Accessories App on Windows 10 or the Xbox itself). It also works with all Xbox Wireless Adapters but the older (larger) adapters require a small change to the Linux kernel. This will be included in the next MiSTer linux kernel release (thanks Sorgelig!) but for now I have a compiled kernel available in github you can use.
I've also tested the latency of this adapter and it's really good. (6.051 ms)
Also, if you aren't aware the driver uses 5 GHz with the proprietary protocol so this should work good for those of you in congested 2.4 GHz areas.
Big thanks to Rysha/Kitrix for their help with testing and other information and a HUGE thanks to everybody contributing to MiSTer!
Please let me know if you find any bugs or have any questions.