Guys, you need to be practical, yet in style: Integrate an RFID tag or other passively powered device in something of interest for DHG. A DM pin for instance, a DM belt, or a DM insignia ring! You can be sure it's always with him. ;-)
A secret decoder DM insignia ring.
Sort like the one that Ralphie got.
Instead of "Buy more Ovaltine" the message will be "Buy more B fares."