For the curious, I tried the following with poor success:

Modern shimano jockey wheels with bushings. Internal diameter of the bushing was too small for the shafts on the Suntour Derailleur.
V.O. Grand Cru cartridge bearing pulleys. Look suspiciously like the ~ 2x more expensive ones from Origin8. The 11 tooth pulleys are too big to fit into the cage of the derailleur. They hit the pins that go between the sides of the cage. This is really my fault, because I didn't read too much, but calling it a "universal" pulley and insinuating that it works with most vintage derailleurs is kind of bogus when they won't work with what's arguably the best brand of the period. I'd have gone with 9 or 10 teeth, personally. It's a shame, though, because the inserts and bearings work really well.

So I bought a Vx short cage derailleur for a few bucks at the local Coop and the derailleur looks rough, but the pulleys look mint. Should work just fine. After I clean up the body of the derailleur, I can probably sell it for more than I paid sans pulleys.