No, there isn't. You can climb a part of the Moncenisio from Susa, using the old road of Novalesa to go up and then go down again to Susa using the new road.
But, from Susa, you are still far away from Sestriere and you have a long false flat (uphill) on a very wide road until Cesana...meaning that any attack is pointless unless you have at least 1 domestique with you.
They can insert Montoso before starting to climb the Sestriere from Val Chisone (Pinerolo), but there are 80 km from Montoso to Sestriere.
They will simply do a double Sestriere....which is very very easy.