An armband in the custom loadout, costing 1-3 points. It'd be placed on the right arm so it wouldn't interfere with any other armbands a character might be wearing. Here's what it would do:
• Automatically turn on an individual's suit sensors to Tracking when their damage reaches a certain value. The default for this value would probably be 100 points of damage, but might be made adjustable by the wearer. Between 20-150 would be a good range limit.
• Toggleable feature, a death-alarm-like announcement or notification. This notification could be said over Sec/Med Comms, or sent to Sec/Med PDA relay, or pop up on the Medical HUD in the same way the treatment notifications do for the Medical Bot. The notification would include the wearer's ID and location. If you wanted to go even further, you can have it list the primary source of the damage, I.E. "The LifeAlert of Judas Osbourne has been activated at The Chapel, due to Brute damage!"
• Wearing a LifeAlert counts as providing consent to treatment in the same way getting a cloning scan counts as consent for cloning. We'd need to decide whether or not having your LifeAlert go off counts as ICly calling for help to Sec, however.
So, people who want it can get it in the custom loadout, maybe you can add a box of them in Medical as well.
Credit for the idea goes to Aero, and the others who discussed this in Discord.