Allow gun reloading motion to be added by modding

[Funukemaguro]

I would like to add bullpup rifles and magazine type bolt action rifles with modding, but the reloading motion currently available in vanilla are too demanding.
I thought of the approach of "replacing the existing AnimatorController with a new AnimatorController that has a new HoldType added", but it was too difficult.

The current situation of "how to add a new gun while using the vanilla reloading motion" is fun and stimulates the imagination, but I think it would make the gameplay more attractive if modders could easily add cool reloading motion.
If you can think of any other good approaches to adding animation, please share. Besides guns.

(I'm a Japanese user, so I'm using a translator for some parts, so I'm sorry if my English is not correct.)