I have RA and yes a revolver shot single action works best for me. I have polished the inside of trigger guards on polymer pistols to avoid blisters on my twisted index fingers. I also had to trade off my S&W Governor due to severe wrist pain from the heavy recoil. I'm still good with .45acp autos but even better off with 9mms and .38 Spl. revolvers with light loads. I'm sure that will change with time. Good luck on your search. tom.
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An end will come on the world, but love and music will endure.
Thig crioch air an t-saoghail, ach mairidh gaol 's ceol.
Old Scottish Gaelic proverb