This sounds like a fantastic idea, even though getting over to Sweden would be a near impossibility for myself. However, I can offer up the entire North of Canada to folks that would like to venture in this direction.
From reading this thread I have noticed a trend of the concept of a Moot/Meet becoming a full-on winter trek. In my experience of leading winter trips here in Canada, one must be very careful when making this transition. For people with minimal cold weather experience, a basecamp with cold-camping can work. Once the idea moves towards moving camp, hauling pulks, learning to use skiis or even snowshoes, the exhaustion, frustration and danger levels climb very quickly. As a family we frequently take 4-6 day snowshoe treks in the winter with nighttime lows that meet the magic -40 mark. With foreplanning, comfort with the environment on our part, our 3 y.o. can hardly wait for winter to arrive. At these temperatures, the cold in-experienced often overheat when moving and become shivering damp bundles of misery in the evening. Simple mistakes are magnified immensely in the deep cold of a northern winter.
My suggestion would be to start with 2 nights of basecamp (with heated shelter) to ensure that everyone is physically comfortable with the transportation means, can thermoregulate effectively, perform camp tasks in cold/dark conditions, and is mentally prepared to step onto the trail. Then leave for the trekking portion once people are comfortable with their own skills and the abilities of those that might need to give/receive assistance. During the trek portion, it would be wise to maintain access to at least one warm shelter, allowing people to safely experiment with quinzhees, igloos, trenchs, or tarps.
Remember that very few people that live in the arctic environs would willingly spend time out on the land without access to warm shelter of some form.
Good luck as this idea gets developed, it sounds like a fantastic experience that I would love to join.