I always wondered about this too.
Since they are already in the game, you'd just have to exchange the idle animations with the reloading ones.
Doesn't seem too complicated. The question is however; what to do with the idle animations?
This sprite was first created for Wasteland 2155 in 2011, so Kilgore knows about it but there is a problem, critter is not finished, so it can't be playable for all weapons, but it might be used for NPCs very well.
I think you missed the point of this suggestion.
He's talking about changing the reload animations for all armor types.