Well, in the DGP there's an effect called "Personnal safe". It's a coin across routine with coins travelling from your hand to your spectator's hand, in which they hold their ring. At the end of the routine, the last coin you're holding visually transforms into their ring, which vanishes from their hand...
I don't know if you can play with this idea and add Northbound to it, but that's actually a trick where the spec's ring vanishes from their hand !