A set you might want to try is a Warpig bridge and Mississippi Queen neck. I was talking to Tim about this for my Explorer. The Mississippi Queen is a HB sized P-90, and it sounds great. Also it has a lot less hum than the regular P-90's (I guess the cover is working like a Faraday box).
I have a few guitars with BKP's and you are welcome to try them too. At the moment I am waiting for a lot of mine to arrive from England, so I don't have the MM or Mississippi Queen guitars.