Use DBE.
Set your sample size to 15 and number per row to 25.
Tolerance to 0.5, minimum weight to 0.1 (default is 0.75) and then generate the samples. Remove any samples which fall on features that you wish to not be affected by gradient removal. If you get lots of red samples, then increase your tolerance by 0.1 and then press resize all, until all the red ones disappear.
Then as Chris mentioned above, select subtract and away you go.
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