Cheers guys, that's what I thought - if I want a P/J I'll have to stick with my P/Js! Incidentally, my SB320 is a P/J with a lovely tone.
However I'm very interested in a Kent Armstrong MM now - thanks Grangur, a more growly MM style could be just what I need. I could add a push/pull on the volume know to swap between the coils which would give me some versatility.