In reply to fuddam:
1.See the Cicerone Guide to the Maritime Alps by Gillian Price
2. Whatever the stated rules are, you can bivouac anywhere discreetly. Ask if you are in sight of a refuge.
3. The Italian side is more alpine and more interesting
4. This year, snowcover is 100 % above the average.
Its a wonderful area.
5. Suggest crossing the divide by the little train to the Italian side , getting off at Limonetto and entering the Maritimes from the South heading for the Argentera.