Here is Detailed Animations. I feel compat with this would be really neat, especially because of how neat this mod is in general!

For now armors phase through the arm as it expects the vanilla arm model, but it is temporarily mitigated by turning off "custom first person arm" model in EMF.

As I mentioned in other comments, compatibility with EMF depends completely on its developer. I already created a comment in its repository about it, mentioning that they asked for it and how to do it. The only thing left is for him to implement it and if they want it so much, go to my comment in his repository and give him support so that the EMF dev sees that they really ask for said feature.

Will do! Thank you!

I'm testing a new implementation for 1.21.9+ in which all mods and resource packs should be compatible. If it works correctly, I'll try to backport to previous versions.