A simpler option may be to save new materials presets for the items and have the user apply those. Especially if you have mat files (in the Poser Pose or Materials library) anyway - just give the DS files exactly the same name as the equivalent Poser setting and drop the .duf in the same folder (discarding the .png); DS will then use them instead of the Poser file (of course this does assume you are creating custom materials for DS).