Yeah, he was helpful, but I think he also found this issue unexpected. From what he said, it should be plug and play (just my luck to get the one that isn't quite that simple). If everything goes well, it really should be that simple once you get past the airbag and the T60.
I kinda gave up chasing down the issues for now; I think it's a wheel hardware issue after doing a deep dive into the codes, plus the reverse camera retains the predictive turn function, which leads me to believe it isn't the clockspring.
Eventually, I'll try swapping back the OEM wheel and...
Did go on a little drive, but the cruise control warning seemed to remain. I buttoned everything yesterday (after a ground bolt sheared and I had to jump a ground from another bolt) and the horn problem is gone (I think a wire was compressing the plate) but now there are a few more error codes...
Just got and installed a Berktuning pre-LCI wheel. Firstly, shout out to Phillip, incredible wheel, amazing quality, and definitely how the car should have come. Install was mostly painless (although taking out the stock airbag was a hellish experience).
However, I am dealing with an issue...