Do you know Pedals de Foc (
www.pedalsdefoc.com) and Pedals de Occitania (
www.pedalsdoccitania.com)? Yo can link then together and choose the self supportage grade you want.
If you are interested inTrans-Pyrenne, you can check the book "La Travesia de los Pirineos en BTT" (Jordi Laparra), and do a part of it. I think that the begining and the end of the route are the most interesting.