How to trigger notifications for members dropping out of Dynamic Groups?

Hi everyone,
I’m struggling with a notification requirement for our Dynamic Groups and hoping someone has a workaround or a "best practice" for this.
The setup: We use DGs heavily, mostly populated by rules looking at specific AD attributes (Department, Office, etc.).
The problem: We need an alert/email whenever a user is removed from one of these groups because they no longer meet the rule criteria (e.g., they changed departments). Since ARS handles these removals automatically in the background, my standard "on-change" workflows don't seem to catch the event—I assume because it's not a manual "Request" being processed through the normal UI/Web Interface.
Has anyone found a reliable way to flag these "drops"?
Thanks!