OK, I will correct you
The Pyrinees are not in the Vasque Country at all. The Pyrinees are shared by Cataluna, Aragon, Navarra (Andorra and France also of course). Navarra is not the Vasque country, although there is a minor part of the Navarran society which is filo-vasque.
The biggest mountains in the Pyrinees are situated by far in Aragon, however there are not many roads there because it is quite unpopulated and there are many protected areas that hamper the construction of roads. The Vuelta could use the Pyrinees of Aragon and Cataluna without problem. It could use the Pyrinees in Navarra with little problem, specially if even in the Vasque country they are going to have Vuelta stages next year.
Please check
http://es.wikipedia.org/wiki/Archivo:Localización_del_País_Vasco.svg the red region is the Vasque Country. The border between Spain and France follows the Pyrinees