I have been testing an MSR WindPro with an inverted canister. I have several custom support mechs for the canister, which will be revealed 'in due course'. This combo works a dream!
Stove: 192 g
100 g canister: ~190 g
Support: 20 g
Total: 400 g or 14.1 oz, INCLUDING fuel!
Add to this a windshield, such as you might choose, and maybe a scrap of foam to support the canister and stove. But you could use a pit in the snow instead of a windshield, and a bit of clothing or anything (or even nothing) in place of the foam.
Is 100 g of gas enough? On my experience in the snow, I say it is. Ryan carries water for the first day, melts water for the second day, cooks both nights for one person, and melts some water for the third day. OK, if he drinks a lot (I don't), he may run a little short on the third day on the way out. Maybe, but this is SUL for two nights ONLY, remember? And I have been using 40 g per night cooking for TWO people.
Just thought I would stir the pot with this idea, at this late stage.
Sydney, Australia, where it hit >40 C (>104 F) today, and at 8 pm it is still >30 C (>86 F).