Sounds interesting! The Pomodoro app I'm using for focus times has this feature built in (I wrote about it here: https://peterszasz.com/finding-focus-through-intention-and-a... ), but before finding that, I would've definitely tried this.
Improvement idea: Integrate with Apple Shortcuts, so the user could automate switching focus mode on and off, tied to changing Apple Focus mode.
Hey Eszpee, Thanks for checking Sinkzone out. I'm thinking about building custom schedules in the next iteration, that would support some basic pomodoro style scheduling for sure.