Using different handles is a good idea. I, too, have done this for years. A handle for the new blade, one for the used blade, one for the scriber blade that has lost its sharp point and one for the old blade that now gets used to apply putty and the like. I rotate the blades down the ladder of sharpness as warranted and toss the oldest blade into a round plastic pill container which has a slot, just wide enough to pass a blade through, cut into the plastic top.
Joe