Doh, you have a set of offset bushings already, disregard this blather, sorry.
Offset bushing option....
https://www.1addicts.com/forums/show....php?t=1789500
I actually set up at -3.4 degrees camber using just plates (KMac), there’s a minor amount of additional available.
It’s a rabbit hole, as you’re aware - have fun!
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09 128i Slicktop - TCKlines, KMac Plates, M3 RSFB, M3 RSB, Hotchkis FSB/endlinks, 1M brace, Wavetrac, Coolerworx, JKVK headers, RPM Motorsport Tune, Yokohama A052 255/40/17s