This is disturbingly similar to a plan I've been considering, which I call the "buddy system" (because it sounds better than "suicide pact"). In my idea, you get your wifi repeaters to check in with each other (pretending to be fake clients) to try to reach the Internet. If nobody successfully checks in for a while through you, you take yourself offline in the hope that someone else can cover for your failure.
This one's a little easier but I bet it works.
ssh+2FA to all your machines, anywhere, without opening firewall ports.