Hey Keith,
In another thread for the '76 purpleheart that just sold a week or two ago off of Reverb, Mica suggested in a linked thread that the optimal solution for the unmatched pickup wasn't buying a new pickup, but having two matching pickups made. This seems salient if the temperamental pickup you already have cannot be fixed so that is has the same voltage/current after its repair that it did originally.
Could you mail the pickups as per Alembic's mailing instructions, and see if the wonky pickup is salvageable with minimal intervention before ordering a replacement/replacements? Just a though. Good luck with the rehabilitation of your new Series 1. It's a looker!
-Zut