Force Apps to Top

I want to use TidByt to send messages to my wife at night when I’m stuck at work and she has put her phone away. Being able to write a message in a message app and then “force” it to the top to be the only app shown would be great, then just unforce it.

A second way of doing this would be to be able to tie an app’s display to an Alarm, with the option to force an alarm on (or just make it for a minute later)