I see we do not yet have an event that reacts to changing the followed driver, so at the moment this is not possible unless you get into some complicated scripting. I have just added a new FollowedChanged event in beta 1.26. Now you will be able to do this:
- Create your widget with 'followed' dataset, and disable 'Start visible'.
- Create a Timer with a desired interval and set to not auto-start or loop.
- Add an EventTrigger with event 'FollowedChanged'.
- On the event actions, add an action to Show the widget, and add an action to Restart the timer.
- On the Timer tick actions, Hide the widget.