If you are open to building something yourself this might be an alternative (disclaimer: I just know of this project but no idea how well it works): https://www.findmycat.io/

I’ve had success with this script https://gist.github.com/interfect/5f68381d55658d334e2bc4619d796476

You should be able to connect to the Chromecasts setup hotspot, get the IP of the Chromecast and then run the script.

The energy prices in Sweden were also mostly negative yesterday, and today as well. Although probably not quite as much as in Finland.

Use Clevis either with TPM or Tang (remote server) https://github.com/latchset/clevis