Joe, I don't think the knobs are easily removable, although I'd have to say I haven't tried. No procedures in BMW tech manuals about the knobs or buttons. I'd be worried about damaging something.
I'd sit tight waiting for a unit with ceramic controls, I got mine from Russia of all places, they are out there!
Chris
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'22 M5CS, '06 Z4M, '01 X5 4.4i, '00 M5, '05 Acura RL, '12 X6 3.5, '01 740, 08 335xi, '17 540xi (yes they all are still with me)