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You can often create a matte from the shot by pushing it to extremes. Remover all chroma from the shot, then crush the bottom end and blow out the top end until you end up with a pure black and white alpha.
This will only work if you have enough luma level difference between what you want to keep and what you want to lose that you can find the sweet spot. This is extremely simple with curves, maybe not so with the FCP color correction.
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