There are several services of varying levels of service, but honestly it's not that hard to write up a small script to fire off an email to get you to turn off

There are several services of varying levels of service, but honestly it's not that hard to write up a small script to fire off an email to get you to turn off the switch for a month. After multiple failures it assumes you are dead and sends a payload email to a trusted friend. You can easily prepay up a good sum on most hosts, aws, digital ocean, etc. plenty of good low-cost mail apis too, like mailgun.