Throw two dice. If one two and any other number shows you give me one dollar. If two twos show I give you 7 dollars. If no twos show its a push. Simple, no cup, no third person needed.
No fair, the whole argument revolves around whether uncertainty about which die comes up two has an effect on the odds - your version is nearly as much a straw man as the proposal to just set one die to two and only roll one die.