I think the idea of entering auto to get out of VRS is a bit academic. Vortex ring accidents almost always occur near the ground so there isn't time for that sort of recovery. I seem to remember way back that a Sycamore at CFS/H was lost in that sort of scenario and it was reckoned that the rrpm was setting off around the dial for the second time due to the high rate of descent. Maybe memory getting hazy now after 50 odd years!