Chambery is a good night stop. There is a hotel 200m away that takes on-line bookings, and a 15-20 min walk down to the lakeside at Bourget to find a restaurant with lakeside terrace.
I'd suggest Cuneo rather than Torino/Caselle. Cheaper, less officious and Avgas available (usually). Crossing over via Modane, MonCenisio pass and Susa valley is usually possible at 9000' in the morning before any cloud build up. That route keeps the forced landing options open for most of the alpine crossing.