I think what I'm going to do is really take baby steps here.

1. Import a new base mesh and transfer (clone) the animation back into the new mesh.
2. Create my own facial mocap expression, then bring it on and test in the FAT sys.
3. Transfer the mocap.......

Man.... this is looking very very complicated.

P.S. As long I know how to transfer my facial capture in FAT to their native rig and export that info into Maya, I think is a big achievement. Then is matter of tweaking... well, at least this is my humble thinking...