I don't know the answer to your question, but I suggest that making one on the frame of a modern replica should be within the capabilities of a decent machinist.
You could use all of the original parts, including the cylinder. But that cylinder would have to be radically modified, and would end up as a two-piece job.
Unloading and reloading would probably require temporary separation of frame, cylinder, and barrel. That's a lot of inconvenience.
I wonder whether the two parts of the modified cylinder could be silver-soldered or brazed together. Would that be strong enough to contain black-powder forces? If it were possible, and if it would be strong enough, you might be able to unload and reload through a deepened capping recess on the recoil shield.
Were I younger, I would see this as an interesting basement-workshop project...assuming that I still had my friend who had a lathe and the skills to use it.