I dunno what Mont-Saint-Clair has to do with anything here. I believe the Hérault dep is right now heavy into ecology and as we all know le Tour is the "biggest enemy" in the eyes of ecologists. Even when recently le Tour was passing through the dep it was deeper in the region. I think within the next couple of years the only places that may be interested in hosting te race would be Béziers (nearby Cazouls-lès-Béziers is interested so it may be an alternative to Narbonne) and maybe some smaller towns deeper in the dep like Lodève, Gignac or Clermont-l'Hérault. From these three previously only Lodève had a Tour (all starts i believe). Rather than with Mont-Saint-Clair you can play around with Lodève (Col du Vent, Col de la Baraque de Bral, Col de Labeil? or any of the Navacelles climbs).