Sergio gabbio works out of Alagna: http://www.montagnadiluce.it/inglese/activities_sergio.htm... .
He's a great guy who guided us around the Monte Rosa in a day: Alagna-heli to Col de Lys-Zermatt-Kleine Matterhorn-Cervina-traverse-Champoluc-Gressony-Alagna all in 1 day.