Mod Request: Weapon idle animation editing shenanigans?

[JKPNS]

Any choombas here savvy with animation editing:

 

I'm specifically looking for a way to make it so that V always idles a katana in his/her sneaking state or sprinting state where its semi-sheathed instead of pointing forwards. Wonder if its possible to just replace the file with the running/sneaking animations etc

 

Is there a reason there are exactly zero animation mods to date? I'm guessing its a very difficult aspect to mod without further tools