I recently thought about using Metahuman for facial animations and using it for character meshes.
However, I faced the problem of all the armor assets and other modular elements were not available to me: I suspect because of the presence of two additional spine bones.
Hey! Im having the same issues. I tried so many different variations. Using epic skeleton (the chest armor) with copy pose, epic skeleton as the master pose parent, and the opposite (metahuman skeleton). All of them had issues with stretching or syncing. How did you manage to hide the neck?
I created a morph target to hide the neck and it still had the weird skin flap