Sorry, I'm genuinely just trying to understand how since I've taken my car to get aligned in about half a dozen places by now without having to do cut the strut brace.
Now, full disclosure, I have not sat there and watched any of the shops align my car, but I also haven't had any of them complain or suggest cutting the strut tower brace.
Let's take a look at this Vorshlag pic below as an example. When I installed my coilovers w/ the camber plates, in order to get them at an acceptable enough camber to drive it to the alignment shop, I loosened the 3 top nuts (circled in red), then tapped/nudged the top of my wheel/tire until they both were at an even distance from the fender, then I torqued the top nuts down to lock the camber setting.
View attachment 365321
The way I see it, when the top nuts are loosened, the red camber adjustment plate is still able to slide along the slot (green arrows) to set your camber without having to come out of your strut tower (represented by blue) or the strut tower brace coming off (represented by the black). This was my same experience when I installed the GC plates on a previous set-up.
If you really wanted to use the little etched markings on the top as a visual, then sure, you would need to cut a hole to be able to see it, but this should really only be used as a "guide" with your actual camber setting being read by the laser/alignment rack.
Am I missing something here?