I think what you want is a mobile "audio interface" that is wired to the mobile over usbc, but then this dongle has a Bluetooth chip in and a 3.5mm jack for the lav mic.
So the phone looks like the dongle is doing the audio and then it's split from there.
I know wires are not cool but It's probably easier to do.
This is exactly what you are looking for except with wire:
Besides. Cyherpunks surely wouldn't use Bluetooth with all of its security issues over the years would they?
Analog cable audio is more secure and private. ðŸ«
However, most audio interfaces in modern devices use USB-C. And Bluetooth is more secure than connecting stuff to your USB-C plug :)
Why you think that Bluetooth is more secure than USB-C? To me Bluetooth seems to be pretty vulnerable legacy.
It depends on what you want to do. Bluetooth 5 leaks a random number that people can use to track you.
USB-C connection, in the other hand, can take full control of your device if you are not careful.
