I'd recommend to export the model with the elf ear morph applied. Then cut off the tip using boolean modifier in blender. Next, grid fill the hole then wrap the new shape to get a morph that matches the clipped ears. You could go further and sculpt the clipped ears to look properly mangled in sculpt mode.
Either way, your materials is really what'll sell the point that the ears were mangled, either freshly or previously but healed into a scar.