Dongle | Bluetooth *

https://apple.stackexchange.com/questions/94402/force-os-x-to-use-bluetooth-dongle-instead-of-built-in-controller

To force the system to use USB Bluetooth dongle by default, run the following command:

sudo nvram bluetoothHostControllerSwitchBehavior=always

This will modify your boot kernel arguments. To do opposite, use never. The change would be applied after the reboot. To return to the default, run:

sudo nvram -d bluetoothHostControllerSwitchBehavior