Idea:

(you can remove so much of the organization with this idea)

Someone make a website that is a "Guardian queue".

1. At any moment, 2 people are on guard.
2. One of these two guards will wait/watch for 5 seconds and hits it at 5 seconds, one of them waits/watches and hits at 10 seconds. So, we have a 5 second guard, and a 10 second guard.
3. Interested participants go to the website and tell it "I'm on guard". The website knows that they're available for FIVE MINUTES.
4. If they wish to be on guard for 5 additional minutes after that, they must click a button again.
5. The website picks two people from the list (one for 10 seconds, one for 5 seconds) and also shows who is on deck to be picked after.
6. It plays a sound when you're on guard, to alert the two guards.
7. I recommend the site have a live chat feature, to keep people paying attention to the page.

Advantages: 1. Greatly throttles down the number of wasted clicks from other approaches, and doesn't require nearly as much planning 2. There are plenty of people not in this group who already want to hit it at 1, so, while not part of the group, are a 3rd level of protection.

Question: Reddit usernames so there's not registration issues somewhere else? (Does reddit have these hooks?)

Technical what-if, only meant for someone who might implement: Could someone "sign up" or "verify ownership" by posting something in Reddit itself? - that is, 1) user claims to 3rd party site that they own the username /u/OutOfStamina, and the site says "ok, just prove it by using that account to paste this random code 394hslkn4934uxn in some specific subreddit (or specific thread even) - and then 3) When the server sees they've done that (maybe they feed it back the permalink to your post as a final step?) it approves them as a guard for that username.

(Should this be its own post somewhere? Is this already an idea somewhere? I'm not following the story line, but this just hit me all at once while replying to someone else)