Courtesy of Mr Jeff Wilson, some tips on attaching Face Robot heads to characters:
“There are a few ways to go about it, depending on the pipeline that you are in.
If you just want to get the end result from Face Robot onto your character and are rendering frames, then the simplest way is to cache the face meshes from FR and bring those caches into your scene file containing the skeleton. This is the most accurate method for getting the animation across. FR ships with Point Oven, but we always used the KP_PointCache plugins from Kai Wolter in production. Kai’s tools write to the PC2 format which both Max and Maya understand. And they are free.