I have sympathy for that, I‘d use it too, if the integration existed. Maybe one day…
In the meantime I‘m sure you have looked at this thread (I know this is not your point with this post):
You can disable Bluetooh in the TR-App. So when you launch TR first, it will grab the ANT+ Device, then you can launch big Z and all what is left is the BT device (uncheck the „controllable“). And, if you’re data-crazy like me, then also start your garmin and connect to ANT+ too… Works rather reliable for me.