I've used a hexamid for almost all my trips over the last 3 years (3 season) including some mild snow storms of a few inches, but thats in light and fluffy colorado snow. Depending on your skill and experience, I think trying out the hexamid in familiar territory and not too far from the trailhead could be a good experiment. If you're mindful of the forcast and the possibility for big heavy snow, then you could set your alarm a couple times (I usually wake up anyway a couple times anyway.) I could see the hexamid tarp lending itself nicely to solo winter camping where you dig a trench out for sleeping space and build up some snow walls to protect from spindrift. There are plenty of steeper walled, purpose built shelters for winter ( I use the MSR twin sister), but if you've already got a lot of experience camping in the snow, it would be a way to push your skills even further, while avoiding a new purchase. That said, if you're needing something for more remote and committing trips or expect heavy, wet snow often, then I'd look for something a little bigger with steeper walls.
On a similar topic, I recently bought a duplex, and I'm thinking about taking it out for some multi day ski tours this winter and spring. I'll let you know how it goes. The mountains are certainly still unpredictable, but the type of heavy snows that would overwhelm a tent like this are most often in our modern and detailed snow forcasts.