Well, there's lots of ways to get a third pickup in your sound. If you're sticking with Europa electronics with 3-postion Q switch, the easiest way to get access to a third pickup and keep the price down is add an assigner switch for the pan/blend operation.
With the assigner, you select 2 of the pickups at a time:
neck and middle
neck and bridge
middle and bridge
The Europa electronics would work just normally after the pickup assignment. Whichever position you are in is what the pan/blend operates.
If this sounds interesting, let me know, and I'll work up a price for you.