My pickups arrived today and gave me a bit of wire routing inspiration. The leads off these are 4 conductors sheilded together with one ground. I'm going to use these leads to send everything to the control cavity first. Then if I can get my hands on more of this wire, I'll run 2 strands of it to the tap switch cavity. One bundle for each pup, 1 conductor tied in with the ground sheilding to supply ground for tapping, 2 going from the 3 way switch to the middle tabs of the tap switches, the last, supplying the other middle wire from that pup.
I think that would be easier and cleaner than chopping the leads off short to try and use the shortest leads possible (which would probably be unshielded) by sending a couple leads straight to the tap switches.