Morph manager 4.0 has an option to do just this. If you put the character into MM and also the obj and set the preference check boxes to remove unwanted materials and add materials that are not in the cr2 but in the obj, MM will create new material entries for you and remove unwanted material entries whent he cr2 is saved. It works well for the obj/cr2 but not for the grouping option which stores geometry with the figure.