That's super cool and a clever way to avoid moving all utxo every 6-14 months, with potential high on-chain fees eventually.

How can you get a warning that someone broadcast the time trigger transaction? You need a fullnode always on that check the address and actively notice you?
I have a full node and already I would love to have a self hosted way to trigger a notification if something move on an address or any address from a given wallet (xpub), is there sometjing like that already?