I’ve actually been trying to implement something like this myself, but I’m trying to do it natively in HA. What I’ve done so far is make an automation for each appliance that calls a script (with variables passed through for messages and whatnot) which notified each member of the household in parallel, based on whether they’re home or not.
My eventual plan is to make each appliance automation flip an input_boolean that sends an initial notification which can be dismissed (either by sensor, NFC tag or notification action). Then every so often or based on a trigger (like door opening, toothbrush doing off, etc.) it triggers the notification script again.