You can have your revolver cylinder cut to accept moonclips. I send my guns to TK Custom but there are a couple of other places that can help you too.
Correct---but it's going to get expensive, and putting that kind of money into a hundred+ year old topbreak revolver might not be the best use of funds. In addition to the
cylinder cutting, the moonclips will be a custom proposition, and I'm guessing they will run $7-$8 per. I've got a nice post-war Webley MkIV-38 that I've eyeballed a few
times along those lines. Someday I might try to find a spare cylinder and machine it, hasn't happened yet. Moonclip revolvers are a hoot, I have a S&W 625 5" 45 ACP and a
8 shot S&W 627 357 mag that I run moonclipped 38 Short Colt in, plus a Second model Hand Ejector Smith that was originally 455 that has had the cylinder shaved.