In reply to dave o:
Skin across to the Helbronner lift from the Midi then ski the Vallee Noire and/or the Combe de la Viage. Or do away with the skining and head up the Helbronner lift.
We did it 2 weeks ago and there was hardly anyone else doing it. 1 group of 3 were ahead of us on the skin and met up with another group on the descent. So quiet in terms of Cham crowds. But you do then have to join the crowds on the Mer de Glace coming off the Vallee Blance and put up with the traffic jam on the midi ridge.