I have used non-P5/P6 figures with the Head Room. When back in Pose Room the head is in the wong place but a magnet with a HUGE zone can position the head into place and a morph can be spawned. The fact that the head and neck don't meet can be helped by deforming the edges with magnets and putting a scaled torus inside to hide gaps. Obviously this must all be smudged and texture fixed in post-work with an image editor.