I am running an Intel-NUC running Ubuntu which has a VM for HA. The machine itself has its own Bluetooth but I cant see whether I can share that with the VM. As an alternative route I bought a TP-Link USB Bluetooth adapter but I’m not sure how I can bring this into the VM to be read by HA OS
Wait. I think I’ve got a better idea than to pull my hair out over getting this to work. What if I use an ESP32 as a bluetooth server and simply have HA reading from that instead? 
ok yeah. That was super easy. Simply plug in ESP32 to the computer, launch ESPHome Bluetooth Proxy to flash it and then integrate into HA. All my Bluetooth devices instantly appear in HA. Feel silly for buying USB adapters now.