@limetech
Can you please also add the following bluetooth driver:
BCM20702A1-0a5c-21e8.hcd
The file is also available in this reposiroty:
https://github.com/winterheart/broadcom-bt-firmware/tree/master/brcm
I would also try the solution of @Chuck Claunch above but I have no idea how to pass the USB bus to a VM instead of a docker.