FredC wrote on Mar 7^th, 2018 at 3:49pm:

. . .a couple of down sides, Driving that dovetailed stud into the barrel will cause stress on the barrel actually bending it. How much? I do not know. Now we are back to a machinist or gunsmith doing the work. I would like to this to be something a careful person with a few hand tools could do in the garage and get professional looking results.

If the dovetail were cut for a sliding fit (rather than driven), it might not bend the barrel. Also seems zillions of rear sights have been tightly dovetailed into barrels without ill effect.
I've cut a few barrel dovetails using nothing more than triangular files. (Might be ugly but would be hidden inside forestock.) Barrel steel is usually pretty easy to hand file.