I have three guitars with BKPs, an SG Standard with a Cold Sweat set (ceramic bridge), a SG Junior with a Stockholm bridge (alnico, like all BKP P-90s), and an Explorer with a Nailbomb set (alnico bridge).
It is the two alnico guitars that I use in the band where I do the pick harmonics. One has a wraptail (the Junior) and the other a TOM (the Explorer). Pretty easy to get them with both if you have a small, hard pick (I use a Jazz III) and the right technique.
I can probably get them from the Cold Sweat guitar too; it's just that I never use that guitar for that kind of music