I finally fitted the Spec Prods Ez Cam XR 81250 bolts today - good instructions, only took an hour all in.
I set them to create maximum negative camber, to correct the positive camber caused by the lift.
I can certainly recommend this as an easy, cheap & effective modification - there is no reason not to do it!
As an aside, I saw on a "lowering" camber adjustment page that 1" of drop generates 1 deg of neg camber, so if the reverse applies my lift must have created 2.5 deg of positive camber. The bolts can correct +/- 1.75 deg, so that might bring it back now to within the factory spec of 0.3 deg +/- 1 deg
The wheels have been visibly corrected and now appear upright and parallel to the rears when view from the front, but I must get a proper camber check done.