Andy,
I completely agree with the desire to keep running it. I liked Windows XP as an operating system and wish it was still viable, but it's not really anymore.
What we've asked Google for continuously is to simply open up the licensing algorithm and distribute something to self-key Urchin. Basically, let anyone with Urchin be able to reset their own license self-serve. If there was a new version to move to I could see this being a bad idea... but since it's dead software, why not let people maintain it on their own as long as they can? This would be a good idea.
If Leslie and her team can help that's fantastic. We're all at the mercy of the same source for resets: Google.