If you toss it in favor of a new one, please toss it my way. A couple of hits with the round end of a ball pein hammer and the safety lever will be good as new. That is how 99.9% of the big time builders fix that. Welding takes too much time to set it up then refit, JB weld or similar stuff will fail at a critical time, but peening the edge will last forever and takes less than minute to do.
Get a copy of Hollick's .45 book, its covered well in there. There isn't much to it once you understand what is needed.
Doug Giraud