Metahuman - Animation Blueprint - State Machine

Hi all
I have a created a animation blueprint using the Face_Archtype_Physics mesh to enable me to create a state machine for the different face animations i require which works well.
I am quite new, so my question is my animation blueprint, does not have the hair/eyebrows etc as these have been aded seperatly when i look at the standard blueprint of the metahuman character.
So how would i use the state machine on the metahuman face/body but also have all the hair/ and also the body features? Is there a way to cross reference them?

Any help appreciated

Thanks a lot