That is such a good idea, I had to try it out with a very old curling brush from the bottom of a drawer, it has soft plastic bubbles on the bristles but its so old some have come off. (hoarding stuff can be helpful )
I rolled it over some border dies which are a pain and one of the most irritating fancy squares
here is the result003_zps84665110.jpg
it managed most with just a couple of passes, the bottom die will still need a bit of poking but I am much impressed