Well I've been also looking to replace the front wheel all together to one with disc brake hub. Would be the easiest. Or just getting a hub and redoing all the spokes idk yet. Still looking if I can somehow make that bracket . Could change the forks. I'll see if I can go to hardware store tomorrow to see if I can fabricate a bracket for a u brake.
Yes from what I understand people have gotten the disc brake on by drilling in the holes correct? And he fabricated a piece that the actual brake fits on?