Cheers for the link Frank, I'll have a good look around that site.
Panamonte, you might want to dissuade me from taking up a soldering iron! I've replaced pickups before, burnt a few pots out in the process, but never rewired something to that extent. I'm assuming that it should potentially be a relatively straightforward procedure, I know what you're saying about the pickup/pole piece heights, but that will take lots of experimentation, where the concentric pot solution should not only allow adjustment on the fly, but an easier way to balance things out rather than getting the toolkit out every time you want to adjust something.