I think you can save yourself some weight by avoiding the icy traverse entirely, if it's even a problem by August. When you come off those short, steep, cruddy switchbacks just below the traverse that exits the headwall and takes you over the pass, if it's icy scramble up the scree slope above you and then stroll back down to your left(south)150-200 yards to pick up the trail. If it's icy, you will see the footprints of others who have done the same. In 25+ years of going over Shepherd Pass, I have only encountered ice on the traverse 3-4 times and have always exited as described above. Shepherd Pass is strenuous enough without adding more weight to your pack.