I think literally destroying the cash would be a good solution except that the normal voter doesn't understand that this doesn't destroy value. So it would have

I think literally destroying the cash would be a good solution except that the normal voter doesn't understand that this doesn't destroy value. So it would have serious rhetorical challenges. (Also, the value accrues to current holders of cash; not sure whether this might be too regressive/progressive relative to the "default" way that transfers are made.)