Feature Proposal: Randomly Recurring Timer

It would be useful for me to be able to set a randomly recurring “timer” with custom messages like “Don’t slouch,” “Get outside,” and “Drink some water,” or even more upbeat things like, “You’re doing great.” Ideally, these could be set to display a certain number of times over a given period (e.g., 3 times a week or 2 times a day) with boundaries on the timing (e.g., 9am to 10pm M-F or 4pm to 8pm Sa & Su).