First of all great post with all that MOST information, I'm sure that will help a lot of people in the future. (In fact I may hijack it and put it on BMW-Carputers.com.
But You missed the one main point of the OP's original question. (See highlighted text)
He has replaced his steering wheel with an iBus compatible one and is/was looking to get that working.
Now having successfully retrofitted an iBus compatible MF E46 steering wheel into an E36 I can say that all he needed is a 10K resistor.