You could go Kent Armstrong all the way and fit an M-Bucker Cool Blades in the bridge position. This is still a very powerful pickup, but having two x four-wire leads (it's basically two dual-blades on a common base) you would have the ability to select just one of the dual-blades if you wanted to match the sound and output of the middle and neck pickups, and then select both of them for a louder output. You'd need to add some mini switches or some switched pots to do it, but it can be done.