Very, uh, French.
There was a gunsmith, since deceased, who would undertake to roll the bulge out and reline the barrel. You'd probably have had to have the engraving touched up, though.
With all that decoration it was never intended to be shot
I don't know about that. I have a couple of engraved guns that I shoot. One is very worn, a shadow of its old self, but the fine scroll is still attractive.
The other is a modern stainless steel .38; a nice coat pocket gun.