The problem would be getting the touch hole in the proper position...I've seen on another forum where a guy tried this and the touch hole was too low and not centered in the pan...

Now, if you could get a barrel, fit to the stock and then drill the touch hole in the proper position you might be in business...

When building a flintlock drilling the touch hole is one of the last things that is done before stock and barrel finishing...

No problem with the trigger because the lock will go into the same place...