I personally like to lean towards the caution end of the spectrum. I don't do anything without seriously thinking it through and giving it a lot of time to get my program dialed in. Snowkiting is in many ways easier but in other ways more dangerous than water riding. It's usually a much more hostile enviroment than what you usually run into as a water rider.
What is the longest distance you've kited? What kind of speeds are you comfortable with? Are you familiar with AT gear and winter camping? If your goal is to cover the trip at speed then you will have to train for high speed kiting with minimal gear. Flying open cells on water is not going to be the best situations for training. Please tell us you know how to ski.
Most of the places we kite are remote enough that if things go wrong you may have to spend the night out in the cold. The same rule goes for snow as water, don't go farther than you are willing to swim or posthole back. We ride AT gear so if things go really wrong we can skin back but that can really suck even if its just 10 miles. Most places we ride there is no cell coverage. We are on our own. Self sufficiency and having your program dialed well before you go are key to successfully pulling something like this off.
How long do you plan to take to make the crossing? That's somewhere around 1500 miles. My longest day this season was 108 miles and I was pretty well smoked and I wasn't hauling a polk and it was on firm packed hero snow.