Start swinging facing away from the platform. As you swing back up to the peak over the platform, let go with both hands and grab high up on the platform ladders, end up in a 'Cross' position.
This trick is possible on rigs where the platform ladders go up very high at the sides and there is a horizontal rung to grab at the right height. One rigs where this is not the case, you may find yourself needing to grab a vertical support which is much harder.