What is sticking the rings- is it fuel gum or oxidation? If they're gummed, I'd use Gumout followed by a soak in two-stroke fuel. Two-stroke oil is pretty slippery, and the gasoline carries it into tight places well. Spraying some Gumout into the soak will help, but the Gumout in the screwtop can seems to not be worth a hoot.
If oxidation, I'd try some heat/cool cycles by heating the piston in front of the salamander and dunking in fuel oil- naturally, keep it turning so as to heat evenly in case it gets hotter than you epected. It's a good way to conveniently get a lot of hot/cool cycles in a short time. 400F or so will drive the moisture out of the oxidation. Some judicious tapping with a hammer handle will help.
You could also chuck the pistons in the lathe and cut the rings out with a HSS tool you've ground narrower than the ring groove.
As mentioned above, you can work the ends of a ring with a punch, freeing it a little at a time, flexing it as you go.
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