I would bet that the right highly skilled gunsmith could do it.My thinking goes raise the dent part way, rebore the area , rerifle the area, draw file the exterior, polish, and reblue.
Now about cost, four figures or even five, liability insurance for the smith? 20 years ago there was a guy in the Columbus area
that had the skill.

Maybe in the UK where it could be proofed, here in the states, I doubt it. Sure sounds like BIG money

bill