Face rig with mixamo FBX mocap

I’m using mixamo fbx mocaps, but no face rig available. I’ve changed the fbx to rigify and still no face rig. Tried adding small bones from the head bone and use automatic weights, no luck.
I’m too deep into the project to abandon fbx; so is my last option to have an identical mesh with a pure rigify armature (face rig included), and work with the camera and editing for the few speaking parts?
Any thoughts would be appreciated.