In case anybody's keeping track...
And...
I just routed out an ugly little channel and sent some wires through to the tuner holes. I'm not sure how well you can see it in the picture, but at the inside edge of each tuner hole, there's a small cutout channel for each of the wires. I'll end up burying the ends of the wires beneath the body of each tuner. Down the center of the neck, I cut another channel for the wire. A little superglue and it's stuck good. Now that I've glued the headplate on, it's invisible.
Before anybody says anything, I've decided to use two truss rods on this neck, for reasons unrelated to this thread. That's why the wire is in the center, and not toward the edge.
I'm not sure if I'd do this again or not. It wasn't much trouble, and there's no reason it shouldn't work, but it's an added step that's not technically necessary. The bigger problem is that I had to change the order I usually do things, and that's got me all messed up.