Learn to "ghostride" the Zed.
On my trip back from Germany to the UK, I got coaught in the worst of it and it took me 18 hours to get back.
Stick the Zed in 1st or 2nd, then gently lift the clutch, no throttle, maybe feather the clutch till you start moving.
Once moving, resist the urge to step on the throttle, just let the Zed "ghostride" itself thru the snow and ice.
I am amazed that more people do not know about using 2nd gear in this whether. I was taught how to use the clutch while I was learning to drive. On my way to work the other day there was a M3 and I citroen stuck all trying to pull over on a hill in 1st! Suggested they used 2nd and no revs (or very little) and the pulled off fine….