Yes, you can Buy a Hub with Disc Mounts, and not fit the disc and have a Rim with a Brake track.
I have 2 Bikes with Disc Hubs and V/ cantilever Brake bosses ..
One I left the Hub minus the disc , ( there is a slight dish for the 100mm wide axle to have clearance for the disc mount & caliper as done in the Hub design)
the other, It came with The disc Brakes and Left the brake Bosses Vacant. Both rims have Brake tracks .
you can seek out Low cost machine built 1, a distributor cubicle wheel building boiler room built 2 ,
or 3 have your local shop assemble the parts you picked out.
Steps towards retail, having increasing costs..