What's the best tool or addon for creating realistic human characters and clothing for Blender?

Hey guys, I have a weird issue with a MetaHuman setup. When the character has no body animation, the head rotation from Live Link Face (iPhone) works perfectly. But as soon as I apply a Body Animation (like a sitting/breathing idle), the head stops following the iPhone and only follows the body animation. Basically, I can’t get the Live Link head rotation to work at the same time as the body animation. It's like one overrides the other completely. Does anyone know how to layer these so I can keep the iPhone's head rotation while the body is playing an idle animation? Thanks