I’ve had really good luck with the “Ready Strip” stuff. Safe around the kids and dogs, and it does work - though you may need to use a couple of coats and elbow grease to get to bare wood.
I’ve also used their ‘Strip-Tox’ product. It changes the lead paint content to lead sulfate(I think). I used this on some old doors that had 4-6 layers of paint. Lead test showed positive before the stripper was applied, and any remaining paint showed negative once it had been used.
With paper towels at the ready, I tried a couple drops of acetone.
Nothing. Didn’t even touch it.
So I tried a few drops of isopropanol.
Same results. No gumming up, the shellac or whatever stayed hard as ever.
It actually comes off very easy if I scrape it, I can do the flat parts just fine, it just takes patience. But around them button thingys I’m not so sure... I wonder if it could be very, very lightly sandblasted? It would take if off in a millisecond!