Philips already ships the absolute best zigbee light hijacking device with their bloom and living colors lamps. The remote.

The first thing I did when I got my hue set was try to see if the bulbs worked with the living colors remote. Not only can you force-pair (steal) the bulb with it, you can then no longer connect it to the bridge without removing it to get to the serial number, or bringing it close to the bridge and using the lightfinder app or telnet.

Quite a hassle, and all you need is the standard remote and proximity.