reverse wouldnt have helped, just easing off the brakes. of even handbraking and full lock to swing the car round and sideways.
i managed a perfect 180 in my cinq on snow like that, it was a beautiful move. but seriously, the hill i was trying to get up was much steeper than that, i never made it up - but i never came hurtling back down out of control
edit: suppose it doesnt help with yank cars being autos tho does it, am i right in thinking u cant engine brake in on?