What about sleeving the chambers to make it a rifled .410 shotgun? It would be great for New Jersey deer hunts.

Seriously, I agree that any work on the rifle should be performed by Westley Richards.

Or maybe Champlins will give a decent trade in value for the rifle in AS-IS condition. There are some decent doubles on Champlins website, and a new Chapuis is probably looking pretty attractive at this point.