With my appetite wetted by Arsey's report of his trip to Castellane I had a look at accommodation around the area.
This campsite had a link to some trips for the area.
Linky: http://www.campingpanoramiqueduverdon.com/en-fr/bikers.php
and the itinerary from the motorcycle tourists: http://tourismepaca.fr/themas/moto/...5-la-route-napoleon-panache-et-virages-serres
and: https://drive.google.com/file/d/0Bw9GDvD4CkDmTTRQcUZYRlZNTU0/view
This campsite had a link to some trips for the area.
Linky: http://www.campingpanoramiqueduverdon.com/en-fr/bikers.php
and the itinerary from the motorcycle tourists: http://tourismepaca.fr/themas/moto/...5-la-route-napoleon-panache-et-virages-serres
and: https://drive.google.com/file/d/0Bw9GDvD4CkDmTTRQcUZYRlZNTU0/view