Being stainless, it ain't powdered metal crap. Peening may work. Try it. Should be easily welded too. Job for a skilled operator and a TIG machine. If you gotta pay, that will cost more than the part! A micro torch and silver solder would possibly work too.
As for the "bet your life" comment, that was only partly related to personal protection. That grip safety is there for a purpose. A crappy repair that caused it to not prevent firing when people THINK it will work could lead to an accident. Best policy when safety is the issue is no compromise. Witness NASA playing fast and loose on the subject!