Not to derail but I've been following this thread from the get go, I had been wondering if the OP had been using something like a trackR which seems much more effective for the purpose of finding your bike (has some serious limitations too though) those of you looking for that route rather than simply identifying your bike after being found may also want to look into those as well. Supposedly the signal can be picked up at 100ft distance IIRC and will be tagged onto the devices network with the rough location of the device which if used how I would, would mean your bike is there. The NFC tag thing seems like a great idea for a bike hoarder but I personally only have about 13 bikes and don't need that to find which one I want to ride... yet.