In reply to rossn:
Avoriaz (above Morzine) has a Via Ferrata and so does la Chapelle d'Abondance (about 25 miles from Morzine).
This site has all the Via Ferrata in the Haute Savoie region listed - 10 in total.
http://www.laviaferrata.net/liste-via-ferrata-Departement-Haute-Savoie.html
Don't know how good your French is but denivele means height gain and longeur cable means the length of the via Ferrata, the rest is self explanatory.