That's what I did as well. It looks tidy of your're not a hack. You just drill the bottom hole all the way through with a 3mm drill and put a longer screw in with a lock-nut. Problem solved. The issue I have heard with the aluminum aftermarket wing brackets is that they are so rigid, your shock tower cracks instead, which would suck.
I would stick with the stock soft plastic and try the screw trick. It works for me.