Ok, the hub thing make sense. I wan't planning on the second set right away, don't have the budget for it. Figured I would comb the want ads for a used hand-me-down set. I'd certainly be willing to take the time and effort to get it shimmed properly if it meant easy swapping.
Is it true 29er disc wheels work too?
Did a test ride today and oh yeah, I think I just succumbed to n+1. The shifting was great, the ride was great, immediately felt confident in the braking. The 105 groupset felt like a big jump from the Sora fittings I've got now. Looks tons fun when I take it for a good gravel ride.
Told them I'd sleep on it, but I think my minds made up and I'm closing the deal.