There are a couple of tutorials about making an eyebrow mask that may help you. They were originally made to change the colour of V4's eyebrows but they also work to mask the displacement of the brows. The process is also fairly easy and only takes a few minutes. I believe that one of the tutorials is on the Daz3d site in the tutorials section. It is called easy colour changeable eyebrows. Here is a link:

http://www.daz3d.com/i.x/tutorial/0/

edit: The link doesn't work perfectly. At the top of the page change the view to textures and maps.