Interesting idea.
Although I have not done this, I have seen people drag kayaks up to Camp Muir on Mt. Rainier and decend the gentle slopes of the Muir Snowfield.
Braking a sled is problematic with no good solutions.
Some people mount chains underneath the sled for a brake.
Maybe use one or two ice screws on each side?
Please keep us informed of the results of your experiments.
