Dirt track climbing into the hills west of Roquebiliere. Youll come out on the D2205 which, if you follow it north, will take you over the Col de la Bonnette.
A dirt short cut to Col de Turini from the D38 Tende road. Probably takes just as long as going by tarmac road but nowhere near as much fun.
A dirt track up to the Ligurian border road.
This route turns into to a dirt road just past La Brigue, so you do need a dirt capable bike with decent tyres as it can be wet in places. This particular route ends towards the southern end of the Ligurian border road.