Personally, I wouldn't want to shoot a Charter Arms revolver in .45ACP. I think it would be very uncomfortable and their guns are pretty rough these days, not like the early ones. If you can find a S&W 325PD or 325 Night Guard they are .45s and have 2.5" barrels and round butts, making one DAO with a bobbed hammer would not be difficult, they are also very light thanks to scandium alloy frames. The 325PD is even lighter since it has a titanium cylinder.
If you find a solid but cosmetically challenged N-frame like a 28 you an get cylinders and barrels off ebay or from Numrich's and turn it into whatever you want. I had Mark Hartshorne build me this 3" .41mag 28-2 using a Bubba'd Highway Patrolman that I never should have bought, a titanium cylinder I got from Numrich's, and a 4" M58 barrel I got of ebay. Mark fit the cylinder, cut the barrel to 3", recrowned it, and made a new front sight. He also replaced the rusty rear sight , bead blasted the gun and blued it. The project saved a POS gun that was otherwise destined to spend eternity in a workbench drawer. If you wanted to create something similar in .45ACP he could do it for you.