Bone record movement of another bone by constraints - possible?

Hello everyone,
I have a problem in the gameengine.
I have a facerig for a Charakter.
Multiple constrains are controlled by the individual bones from another facerig (Static above the charakter for easier animation) . This allows me to combine the other rig with the Mocap data. In the normal rendering process its working, but not in the game engine. Is there a way to pick up the motion (created by the Constrains) and turn it into an action on the main face?:eek:

Sorry for my bad english. I’m from germany :spin: