I installed a set of K-Mac front adjustable bushings on my old C280 when my friend owned it. It provided decent adjustability for camber and caster. As far as I know one of the only solutions right now. Beware if you attempt this without a press, it can be a pain in the ass. I was able to do it with a huge vise (after I broke a smaller one) to press the bushings in.
2012 535i
2005 545i - Retired
1994 C280 - Retired