Im not certain if this is the best solution, but you could Export>As Wavefront OBJ, uncheck Universe, but check cap and all layers in the subset selection window, Select Yes for including morph targets, then uncheck all export options (2 checked by default I believe) Then import the object back in, unchecking all import options, and it shoud import right back into position on the head that you exported it off of. Im not certain if this is going to disable any morphs of the hair or not or if its the best solution but all parts should become one prop that you can hopefully manipulate in WW.