I saw your bike in the YouTube post and I thought I recognized the sign on Brasserie at Col de la Schlucht. Good to know it is still there.
The bike is quite ingenious. Watching the video, I was curious how you handled traction for braking - you answered it here. Do you think that studded tires (spiked tires) would be better than chain? Of course, I understand that you can remove a chain very fast when it's not needed.
How is the bike changing directions? I saw that you were steering it with throttle, sliding the rear wheel. Does it also follow the front tire in the snow, or is sliding the rear the only method?
Welcome to the forum! You are a true Adventurer, do not be shy about posting here - mechanical translations work, too.
Happy New Year, Bonne Année !