Thank you for the nice guides @aronowski!
Unfortunately this is not a secure way of using Bluetooth. By default, PulseAudio runs in dom0, making the Bluetooth isolation fragile. For a proper compartmentalization, it should run it in a dedicated sys-audio qube. Configuring it is not very user-friendly yet.
Your guide can still help people who are aware of possible security problems and choose such path. You may want to add a note about it to the guide.