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I do like that idea indeed.....like it very very much

buy some glow in the dark powder off trademe...dirt cheap...and add a little to the polish..makes huge difference in low light.

try it with wool filler too ....might help,might not LOL.... only two projectiles to find out at end of day.

indeed a slip in insert that can be removed later....would be really interesting to load up a few rounds of 00buckshot and see what it patterns like without wad and do same with birdshot....would...

but yeah you already have .458 barrel so whats inbetween 45lc and 45/70 ???? pretty sure there is a modern handgun round or two.
of course the LOGICAL step as you say would be go 45/70 and as for...

that 44/70 idea that popped up recently.......