So It looks like they cant get the adaper knurled. Its possible, but takes specialized equipment. I've came to the conclusion that the disc rotor adapter will be the most reliable way to go. I went to the shop and a Tektro 900 extra long reach caliper fits perfectly in the hole for the rear wheel. The rim is designed to take rim brakes. It's just painted over. I'm going to have ss spokes installed at the shop for extra strength. Still waiting on the axles. Will be putting everything together after a spoke job.
