Shortcut: Set a periodic timed action

Shortcuts
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I have a simple meditation timer shortcut that:

  1. Asks for input (duration in minutes)
  2. Adjust Date to add minutes to current
  3. Sets Focus to DND until the ending time
  4. Sets a timer for duration.

I would like to add a function for the phone/watch to vibrate every 2 minutes prior to the ending time and I keep hitting dead ends. Any ideas would be greatly appreciated!