Well, that is kind of what I was worried about. I would have a real problem(from an engineering perspective) with the idea of putting a thin wall insert into a chamber. A chamber is a pressure vessel. The insert needs to be treated as a separate part. Which means it must hold the pressure with the appropriate factor of safety…which is quite large for human use and risk of death or dismemberment as a potential failure outcome. Will it be thick enough to withstand the full pressure load on its own? If not, short of doing some kind of TIG wire chamber fill and rechamber job. I’m not sure how to make it homogeneous enough. That is the key. Welding and recutting a chambe is also a bad idea in a world where barrel blanks are reasonably accessible.
If you want an expert to speak to, I would get a hold of Chuck Rodgers. He has done some serious 1911 repair by silver soldering in a block of steel and recutting.
Example of his work.