This is a technique that we have just mastered whilst bored waiting for some new students to walk in the door.
Entry auto as normal reduce airspeed back to zero, pedal turn 180 and apply aft cyclic estimate backward speed to around 50 kts look out as normal for the flare height, commence flare by pushing forward on the cyclic. Hold flare until zero speed. There no problem with tail rotor striking the ground as this is a backward flare ensure no run on speed to avoid spade end of skid digging in.
Its sounds dodgy but its not that hard to perfect