all it takes to make any 1911 safely handle 460 Rowland is a spare barrel, re-chambered to the .060" longer case of the .460 case. It's the thick walled case that makes the round safer. It doesn't blow out at the feed ramp. We've also got much better powders for the .45 case these days. Even back in 1980, tho, a friend of mine was driving my custom-molded 230 gr H&G swc .45 slugs to 1000 fps with Blue Dot. That's 500 ft lbs, lots of penetration, cutting a big hole all the way thru a big animal. and you're not stuck with a clunk, otherwise useless huge clunk of a revolver, either.
