The other thing you could consider would be using some angled pickup rings on top of the scratchplate, to help make the pickups more parallel with the strings. That's what I was going to do when I had an SG Standard.
The only problem with that is, the springs are still pushing against the flat bottom of the scratchplate and trying to push the screws into a vertical position, despite the angled pickup rings. To solve that, I was going to buy a spare scratchplate and enlarge the pickup cutouts so they'd be the shape of humbucker cavities in, say, a Les Paul, then I'd put the angled rings on top of that.
In the end I sold the SG Standard and I now have a Tokai which is early-'60s style with mounting rings and the small scratchplate, so no problem. :lol: