This is the reason I decided that I would change my Bedford rifle project, into a Somerset rifle project. I found several flint Somerset rifles, with the Bedford profile, but without the rattail lock, with the stylized cock.
This is a perfect niche for someone that is already producing castings,that could make a plate, a detachable pan, and frizzen, along with a suitable Bedford style cock, that would use some of the standardized lock internals. I would think a conversion kit would be cheaper to produce than a complete lock.
Hungry Horse