Getting away from low spoke count fashion wheels is a good Idea, you need a disc hub and a touring width rim,
ones around an inch wide Sun CR18 a good long made favorite.

A 29er wheel is a 700c rim with disc hubs , maybe there is one of those in the shops wholesale catalogs ?

machine built wheels all need hand work once they arrive.
if you don't have wheel truing skills you need the shop's guys to do that.