Sure, you can keep it quick and secure with a simple alphanumeric system that only the med squad can decode. Pick a base‑36 code—numbers and letters—and attach a one‑time pad that’s stored in a secure log. Each triage box gets a short hash of the patient’s ID, priority level, and a checksum digit. The med squad sees “A9C‑3” and, with a quick look‑up table, knows it means “critical, blood pressure low, need IV.” Add a tiny QR‑style marker so you can scan it for a full readout if needed. That way the code is hard to tamper with—any change messes the checksum—and the crew still reads it in a heartbeat.