Keybow attached to Pi 4 needs another keyboard attached to function

As the title states - been using a keybow on Pi4 for a while with another keyboard attached via a Logitech unifying receiver - all is good.

However if I detach the unifying receiver and reboot the pi, the keybow ceases to work - latest fully updated buster image.

Thinking of moving my setup to a 3a+ which has only one USB port this isn’t going to go well if its not going to work by itself (I don’t need a standard keyboard - keybow literally sends mpd commands and calls scripts for me)

Any help in getting keybow identified and working by pi as a solus device ?