I was mistooken!!!
Before I absolutely committed to a faceplate job, I had to try it in my four jaw. What do you know----it fit, barely. One jaw is out to the point where there are only two turns of the chuck key holding it, but it cleared the ways by about half an inch and tightened up just fine. After turning the spindle by hand, checking for clearances, I started the lathe on it's lowest speed (which is very slow indeed) and seeing that nothing was going to explode in my face, I ramped the speed up to 220 rpm and cut with an HSS tool. Everything seems to have went okay, and I'm finished with that set-up.