Oh yeah surely not the optimal solution but when your car is fully fabbed already, painted, and as a change of plans, you want to add a little negative camber, this is the easy thing to do. You could do the LCA pivot relocation which is probably better up front and cheaper in parts cost. Neither of these will give you extra tire to fender lip clearance for sure. If anything, it could make it worse. For fender clearance I would investigate slotting the towers first, if you don't want to mess with bodywork and wheel changes.
I did not find that my car had much negative camber, if any, in the rear or front, in its stock configuration Jon. But then again the specs are strangely wide and I didn't like the way the car felt stock anyhow. But that is a topic well covered elsewhere.