As an alternative to editing the cr2, you should be able to do the same thing by applying a pose file, e.g: { //Your Head.pz2 version { number 3 }

actor head
        {
        storeageOffset 0 0 0
        objFileGeom 0 0 :Runtime:Geometries:Your Folder:Your Head.obj
        }
}

I have tried this a few times, and it does work. I do seem to notice Poser slowing down somewhat when an 'objFileGeom' is applied via a pose file to a figure, and I assume that this slowdown also happens when the same change is made by directly editing the cr2, but I have not done any experiments to check this.