This isn't Poser's problem,  DAZ never put all the face morphs into the eyebrow.  Because the eyebrow is part of V4 I don't think the usual way to transfer figure morphs to conformers will be able to help.  The only way I see is to a modeling program the can skrink or snap the eyebrow to the face.  Of course not only will you need to do this for the custom head morph but also for every expression morph.