You're welcome :)

Poser generally objects to polygons of more than 4 sides. Possibly the quickest way to get an alternative mesh will be to open the scull cap OBJ in UV Mapper and triangulate (I think the shortcut key is "t"). Save the OBJ with a new name, import it into Poser and parent to the head. Save as a smart prop. Try it and see, I'll be interested to see the results.