From observations of our Blue Devil, I'd say that a damsel might result in your objective being met.
Our Blue Devil typically lies in wait amongst the crevices and caves and darts out whenever another fish wanders by. During the day, the other fish try to stay as far away as possible, so if the damsel chooses a given cave for it's standard staging point, the other fish will go elsewhere.
I think it all depends on whether the damsel takes ownership of the rock structure you're wanting to get cleared out, or selects another spot. Our damsel suffers from "little dog syndrome", so even a substantial size differential shouldn't be a problem for an aggressive damsel.
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