The Portes du Soleil is a very spread out area.
Why not get in touch with those people- they are a very small company based in Greenwich UK and they run school, youth, family and group trips to the Portes du Soleil and are based at Torgon, easily reached by train and bus from Geneva airport (train to Aigle then bus up). They often have spare capacity and can take on a few extras. Most of the staff are Brits, Ozzies and Kiwis, and most ski or snowboarding mad and know all the best places to go.
www.skicompay.net
Talk to Gerry shirt, owner, or either Becky or Olie, right hands. I've used this company for over 15 years with all sorts of groups and they are brilliant. Chalet right next to the Jorette slope, great ski and snowboard hire, ski pass includes Torgon (CH) Chapelle d'Abondance, Chatel and super Chatel (F) Morgins and Champoussin (CH) - so in a days boarding you go over the border quite a few times. Much better than a Youth hostel, simple but comfy and fun, and great people to go out playing in the snow (staff are off to the slopes as soon as breakfast is cleared!) and fabulous value for money. Formula includes a good breakfast, afternoon tea/coffee and cake, and 3 course simple dinner. Of course lunches can be had on the French side, the traditional chalet at the top of Chapelle d'Abondance slopes is great and very good value, and so is the one at Chalet Neuf in the Chatel ski area.
If you or others have any questions about the Ski Company and Torgon, I'd be happy to reply, as I've been there so many times. They also have apartments for families or small groups of adults separate to their 2 chalets, and studios with en-suite above the dining area, just meters from the main Jorette slope.