That's certainly a gun/round combo that puts boot-to-arse! I'm glad you got to have some fun with it. I'd say get another G21 just to use with .45ACP, and keep the FDE G21 set-up for the .460 Rowland. That is certainly taking your Glock experience to the "next level".
Glock 17 (Gen1), 19 (Gen2), 21SF (RTF2), 26, 39
Glock Armorer (AC), Glock Instructor (IW)
Glock Advanced Armorer (AA)
Remington 870 Police Magnum, Benelli M1 S90
Smith & Wesson 13-2, 16-3, 36, 66-3, 681-3, 3000