Automation setting default bleutooth device

Hello,

On my rpiB the internal bleutooth cant find a device. I have installed a USB bleutooth.
now i have to manually set in bleutoothctl the default bleutooth device to the USB bleutooth. This has to be done every time i restart the system.
What i want is an automation that finds the available bleutooth devices (bleutooth list) this should give in my case two devices. The onboard bleutooth device with 00:00:00:A and the USB device.00:00:00:B
If the default device != 00:00:00:B then set default to 00:00:00:B

is there a way to automate and set the default bleutooth device to the one i want?