So make it more complex and have it "fire if human is not in touch" then. Have it give some level of notification that there is a problem needing human attentio

So make it more complex and have it "fire if human is not in touch" then. Have it give some level of notification that there is a problem needing human attention and that if possible, they should get in touch with you. You could give out keys to a secret (see: Shamirs Secret Sharing) so that if a few people got together then they could find out more but don't tell them who the others are (if they are likely to be at your memorial they will find each other). Give out secrets in sequence so that the longer it goes on, the more people get involved - tell the later ones who the earlier ones are. I guess it doesn't have to be all-or-nothing on the first day the software misses you?