Annoyed by the filter situation, I tackled the alarm situation again.
Letting the battery drain didn't work, since it decided on an obnoxious death rattle in the middle of the night.
So today I powered it off, quickly muted the tamper trigger, and then removed the battery completely.
Pressed the panic button to celebrate and was greeted with silence!
Welcome to thundertoot! A Mastodon Instance for 'straya