I got word back from the rebuilder's tech support, they said to try it, so I will.
I already built the inline fuse holder for my aux water pump, though i misplaced the fuses so I haven't got it installed yet. If anyone is curious how to build one, I can do a writeup (I've made several custom wiring harnesses for my car to add stuff like heated seats without modifying the existing wiring, been meaning to write about it, but I'm just too busy lately)