@JonPrT - Welcome to the site. Please wander over to the Introductions section and tell us a bit about yourself. You will also want to familiarize yourself with this thread (it has good information about the site): So yer new here, huh?, and this thread (our community rules): FirearmsTalk.com Community Rules.
Pictures always make these kinds of issues easier to work with.
I am not a gunsmith, but your planned approaches do not make sense to me - cutting a barrel and then welding it back together or using epoxy are great ways to injure or kill yourself when you fire it. So too with heating the barrel enough to manipulate it. My suggestion is to find a qualified gunsmith to assist with this.
Pictures always make these kinds of issues easier to work with.
I am not a gunsmith, but your planned approaches do not make sense to me - cutting a barrel and then welding it back together or using epoxy are great ways to injure or kill yourself when you fire it. So too with heating the barrel enough to manipulate it. My suggestion is to find a qualified gunsmith to assist with this.