Just spitballing on the idea of this being a service- Wonder if it would work for the canary-creator to also have a bot that watches the btc mem pool, and if it sees the .5 btc from this address being spent, it front-runs it with a transactions that has a much high transaction fee and directs the funds to a new safe wallet. Probably some risk of the bot failing to front-run, but otherwise it would have all the benefits of a $15k canary without the downside of losing all of the money.
Interesting idea. Would also be cool to try to trace back the IP of the first node that announced the transaction to the network so you could try to figure out who the thief is (assuming they aren't using a VPN).