Yea I've seen them talk about them re-programming. Mind you, I also see them say they don't actually know who can re-program them lol

A system I could retrofit that uses normal 2 wire VR sensors would be handy, which I think earlier systems do ?

Not sure on tooth count, from what I've scoped on my car I'd say it's around 28-30 teeth. Can't physically count as it's one of the bearing type triggers. But trying best to do single wheel rotations, it seems around 30 teeth. Pretty sure most BMW systems use a much higher tooth count.