it would be pretty trivial to get a twister client script running on the laptop to post the location of the laptop, if you can script the finding out of the location.  it wouldn't post the location to the DHT, just to a torrent it would then distribute to followers that would find it through the DHT, so it's no worse.  you could even make it post it as a DM to yourself, so nobody else would get info about your whereabouts until the laptop is lost, because DMs are encrypted