Exorcism macro

I want to know if there's a macro (or some other way) of having a button that only casts Exorcism when The Art of War is on. The closest I've gotten is this macro:

Code:

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/cast Exorcism
/stopcasting

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But it looks kinda weird because if you don't have AoW it triggers a casting bar that turns red immediately. Even so, it works; I'll stick to it if I can't find anything better.

I also considered doing it with an addon but the CastSpell function is completely protected.

There isn't anything better than watching for the procs manually.

Your macro will somewhat work, but if you press it while you don't have TAoW proc it will also reset your swing timer.
The lost AA and potential seal proc will be dps loss.

I may be wrong but it doesn't look like it resets the swing timer at all.