Oh, man! I'm so sorry to hear this. That is totally effed!
I dunno what to say. I'm a big fan of the bike as bait idea, or man traps. I personally like the idea of coming back to my bike, and having to kick aside the smouldering corpse of the c*** who tried to steal it before I can ride off.
Unfortunately, that is frowned on, so I hope you have some good luck with the tracker.
And I know it probably doesn't help, but it sounds like you've done everything reasonable to protect it, so try not to do the self recrimination thing.
Also +1 on the getting a "Gunka" to ride to work.