Hi!

Im looking for a Magnetic Adapter Mount, like the one that comes with the Action 2, but with a built in USB-C connector, so that I can connect my Rode Wireless II via USB-C without having the dual-scree attached.

I have found several 3:rd party Magnetic Adapter Mount with integrated chagring but none of them supports Data.

Sorry, there's no such thing.  It seems that the active components in the screen module are required for audio, or that the data connection configuration has not been made public by DJI.

The screen or power module act as the 'brain' of the system - without it all you can do is charge the camera module, not attach accessories or pass data.