So the good news is that the disc is on.
The install required a little bit of fighting (and Dremeling), but nothing major. I had to grind back the swingarm a little bit to get the banjo bolt on the caliper, along with loosening the mount bolts and removing the hub nut. The good news is that after I did that, the tiny bit of rubbing I'd noticed previously is completely gone.
I used the speedo cable hole to run the brake line. I had to grind it out some with the Dremel, but after I did that, it fed through without a hitch.
The Crimaz master cylinder setup, however, was a bit of a disappointment. First, the holes didn't match the mirror holes in my headset, so I had to take the mounting bracket off to drill a hole in it. Which was obscured by the master cylinder, of course, so I had to mount the bracket, then install the master cylinder back onto it.
I hooked it all up and started filling/bleeding the brakes...and filling and bleeding...and filling and bleeding...and eventually, I got sick of trying and let it go for the night. The brake works. The fluid rises in a tube on the bleeder, so I know the system has at least a little pressure. But...the caliper barely moves enough to rub the disc. Definitely not going to stop anything like that.
So right now, I have the best looking, worst looking front brake I've ever owned. Go figure.
Anyone have any advice for where to go from here?
In clutch news, I adjusted the clutch waaaay back in and all now seems to be well. I'm putting it down to slipping causing heat causing swelling. I'll continue to watch it closely, not that it's going to see any use until I get the front brake going.