So I am interested in pretty much the same, from the above the places mentioned are:
Bagnere de Luchon, France
The Gers, Gascony, France – see SW France Cycling Adventures
The Vosges, France
The Alpine route 1, Switzerland
Vinschgau in Süd Tirol, Switzerland
Zona Zero trails, Ainsa, Spain
Cami de Cavalls, Minorca, Spain
Two more I have spotted and would be interested in opinion of are:
Livigno, Italy
Finale Ligure, Italy (other recent threads on this)
Any other ideas?