My approach worked. Here are the steps from the "missing manual"...
1. Drill the innermost rivets to release the clutch plate from the spline mount;
1a. Sheer the rivet tailings with a chisel (if necessary);
1b. Pry the clutch plate from the spline mount (if necessary).
Note: Look for and retrieve the small spacer(s) nestled behind the clutch plate.
2. Obtain a smallish three-jaw puller with flat-end hooks--grind/file hook ends as necessary for suitable fit.
3. Thread 8mm hex (or Torx) head into compressor shaft;
4. Finegal the puller around the edge of the spline mount;
5. Twist the threaded push rod until the spline mount is free.
The snap ring that holds the pulley is now accessible. I'll remove the pulley next (with a larger three-jaw puller) which provides access to the field coil and the snap ring that holds it. I may also replace the bearing in the pulley 'cause, why not.
Oy. So straightforward a job turned into a onery chore because of a little oxidation (and inexperience with immediate alternative courses of action in such circumstances.)
