I recently did a complete non iDrive car to complete Idrive swap over with CIC controller in my e82.
If I am reading this correctly you have a professional radio and are adding the android radio and screen that comes out the top of the dash where the factory idrive screen was installed?
If so the factory location where the controller has wires thats go into blank pins in a socket behind the glove box. I cant remember exactly which pins are needed to but this website should help with understanding your wiring harness.
https://www.newtis.info/tisv2/a/en/