The answer to your iDrive upgrade question is basically the standard, "most anything can be added/upgraded with sufficient money." A few people on various forums and my dealer have found the same conclusion: Doable, but it would run into thousands of dollars with the hardware, software, and then the installation. The more sane step would be to buy a new car!!
Really liked this - "remember that I'm the one who asked if a manual to DCT upgrade was possible. So compared to that question (for which I was lambasted), this one is genius!"
I liked the question!!
I suspect several have thought about it, with no courage or energy to ask.
Seeing the humor is refreshing compared to the dry seriousness that sometimes manifests itself here ...