Can't believe I didn't see this until now! Retrains all original functionality, adds THE critical missing thing (at least, for me).
Carphonics is a great company that has been solidly supporting the BMW (including e46/e39) community for years. I've been running their upgraded BM53 for probably a decade, with no issues.
Looks like they have two ways it can be controlled-- either with a iDrive looking controller thing, or with a retrofitted touch screen!
Video, of the controller interface:
https://www.instagram.com/reel/CmQ9N...YmMyMTA2M2Y%3D
Video, of the touch screen interface:
Pics: