I saw this controller for a second in the video for the able gamers foundation and was never able to find it. I heard it was at Evilcontrollers, but it I didn’t see it in their list. Today, I noticed it. I’m not sure if it only recently appeared or if I had just missed it repeatedly.
The Adroit controller system looks like a pretty good commercial solution. It offers not only a switch interface for Xbox gaming but customization as well. You can map buttons however you want as well as set options like “holding” or “turbo”.