Is that a question? A reverse countersink is typically the same as a blind countersink. You drill the hole thru the material, attach the counter sink head and it countersinks the far side of the material on the up stroke rather than the down stroke.
Regardless it will not work for your application.
If you are looking for the reverse drill bits mentioned previously? You will have more luck searching left hand drills. As the spiral flutes are ground in left handed and sharpened so that they cut while running the drill motor in reverse.
When used on Right handed bolts, they will often grab the bolt at some point and back it out, if it is not too buggered up or Loc-tite'd in.
Hope that helps