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I can't extend Camera to override (or hide) the fov property to add a change notification mechanism because if I do I then can't attach it to a GameObject because it "doesn't extend MonoBehaviour" (Camera extends Behaviour). Is polling camera.fov in one of my scripts methods the only way I can monitor it for changes? Is there some other pattern people use to watch variables (in classes like Camera which you can't make any changes to) for changes?
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I don't have an answer for you, but it does seem like polling might be your best bet here. Maybe someone else will have a better suggestion though.
I've gone with polling for the moment, the only other way I came up with was to require anyone using the component to change all there camera.fov references in the project to a property or method of my component. Which is horribly bad design and would be very error prone.