I would think welding would work, but it may be a little over the top. If you think about it, they have been welding up 1st gen Colt SAA hammers and triggers then re-cutting and finishing them for some time now. I am sure it would work with the right welding material used.
However, as DFW stated, reproductions hands are now being made and would be a much easier option. Jack First is actually making just about all the internal parts again, except rebound levers. Most are priced appropriately too. Although for a serviceable hand, peening will solve the issue.
Go over to the Colt forum and there are a bunch of 'sticky' threads in the Smithing section that deal with working on the Colt V spring. One of them is dedicated to hand stretching. I created them because a lack thereof existed. DFW contributed very useful tips, hints, and cautions in the threads too. Check them out.
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