I looked (briefly) at having ago at this zeronoo.

I have an e60 business nav setup (screen, controller and base unit (raido/nav unit) bought off ebay), I made up the looms and had it all working as OEM on the bench (I was thinking of using a gutted e46 wide-screen housing to mount the screen), but other projects pushed it back.

As Jochen says, you would need some sort of protocol converter, I never got round to having a good luck at it.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.