Thanks Ken and Mike.
Killing a few birds with one stone; here's a (sadly) typical surface as sprayed. Ignore the dirt specs, that's a different issue:
Not the nubby orange peel I think of as sprayed too dry. Sort of "irregular", wavy, not flat. Perhaps I'm just having a buildup problem, ie, the primer and base coats are not slick enough? Most of my past large panel painting experience was with Poly Fiber on fabric. That means everything was sanded with 400 wet a few times until just prior to color.
This is the other side of the part after machine sanding with 1500 Trizact, a little hard blocking with 2000 wet, and a few passes with a 1900 RPM buffer, white 3M pad, and 3000 grit 3M compound:
Jimmy, like the other guys said, you can fix it without stripping.