stanza and 200b hubs are the same any way, and the bearings are the same as VN ones from what i could tell (didnt lok at part number but they were interchangable)

i really doubt that you will be able to find some 5 stud hubs that will be usealbe with the 200b brakes, simply because of the disc bolting on behind and the subsiquent huge offset of the caliper

might have to go for a walk around some wrecking yards till you find a 5 stud hub with the disc bolted on behind it

would you be able to machine the back of a standard hub flat then re drill the holes?
this may be the easiest thing to do, then just weld up the unused holes so that the hub retains some strength