i'm sure there was a thread on ESG with a link to a site with short-shaft push/pulls that do fit an SG. but i can't seem to find it now.
thing is, if you send back your warranty card to BK, you'll get a free mini-toggle you could use. (unless it's changed since i got mine, i dunno) anyroad, you could replace one of the tones with a miniswitch, then you don't need to drill any holes, plus it'd probably be simpler to put back to stock incase you want to sell the guitar at some future date.