I would start by labelling the 'head' part, then in your code you can find the head slot
Slot slot = skeleton.findSlot("head");
Attachment attachment = slot.getAttachment();
if (attachment == null) continue;
if (!(attachment instanceof RegionAttachment)) continue;
RegionAttachment imageRegion = (RegionAttachment)attachment;
imageRegion.updateVertices(slot);
TextureRegion tex = imageRegion.getRegion();
maybe you can turn the textureRegion into a physics object.
I don't know how to remove the head though.