How to create a reminder that behaves like the auto shutdown warning

I have a bad habit of ignoring reminders, but there was a time I had automatic shutdown active and the warning it sent was super effective at breaking my focus. The problem is I don’t know how to trigger just that style of warning on its own, as you only get one alert per shutdown command and I would like to use them as reminder popups.

I need something that pulls focus, and requires me to stop and interact with it to be able to close it, not just click off. I’ve tried finding apps that do this but everything I find tries to be non-intrusive. I’ve also tried to find ways to access the specific pop up type that the shutdown reminder is, but I can’t seem to find any information on it specifically.

I’m very new to using things like task scheduler so I’m certain I’m just missing an odvious solution, so any help would be appreciated.