When I asked my lady-love this morning "Ok, about that ammonia for stripping this figure..." she says, "Pine-Sol should work just fine, too!" and handed me the bottle!
And it did! Pulled the guy out a bit ago and scrubbed him under running water with a soft-bristled toothbrush. Most of the paint sloughed right off, with only a bit holding on in the creases, so back into the drink he went. His bush-hat popped off during the clean-up, so if the rest of him goes to pot, I'll have that left off for another figure!