There are basic brow morphs for M4 in the Morph++ but I am assuming that your morphs drastically alters the features.  Best bet would either be magnets or the Morph Brush if you own P10/PP2014.  Depending on how detailed the changes are, you could create Target Morphs on a head obj and import them into Poser.  However, if the mesh is altered too severely it could change the vertex count.