@Charred - I had to do some ceiling repair on my old stipple ceiling last year, and I was surprised how easy it was.
You can buy some inexpensive stipple repair kits from the home improvement store. It’s a can with some of the stipple mix, and a sponge. You can also use any old sponge around the house if you want, but all it takes is a dab and you’re done.
In addition to their vintage quality as you said, I happen to think that the stipple ceilings are easy to fix.