aerohead,
I doubt that the airflow which would be affected by the spoiler you describe is laminar in flow. In fact, it should be rather turbulent. Isn't the spoiler simply moving the point of complete separation aft so that the area of the notch back is more stable, even if it is a "dead" area?
If one were to place a spoiler at the top of the rear window it should extend the separation some distance and then a second (lower) spoiler could extend the complete separation even further.
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