There are definitely pro welders that can build up the combustion chambers with weld beads, then set the head in a CNC mill and cut the original profile back out.
That would cost more than a nice replacement head, FOR SURE, as I'm unaware of anyone that has a T140 combustion chamber CNC profile data file available... (although one may exist if you search)
author "Old Bikes"
too many bikes to list, including:
JPN, 952 Prototype, MkIII Interstate, Combat Dunstall, VR880 SS, Triton