I wouldn't mind testing either if you're still looking for more people to help. I have access to two different Bluetooth adapters (this and this), an original DS4 controller, 2x original DS3 controllers, and 2x Xbox One controllers, as well as multiple computers I could use for testing (all Windows 10 1809 currently).
I do desktop and server support for a living, so I'm comfortable modifying the registry and adding/removing drivers and all that. Not sure what all might be needed in this scenario, but I'll do whatever you may need. Just let me know.