In reply to BURTON83:
Can you ski and ski tour? If not, I’d recommend using your time to learn to ski or to get into ski touring. It will open a whole universe or winter and spring Alpine climbing for you. Otherwise you’d be limited to easily accessible routes. Depending on snow conditions, you might be able to get to some further away routes but the descents would still be slow and laborious. Say you want to do the Gabarrou Albinoni. You might be able to walk to it in say an hour and a half if the snow is fairly firm. If it’s knee deep, forget it! May be with snow shoes it would work. Whereas on skis we we started climbing an hour after leaving the Midi, even with a bit of faff. But the real issue will be the descent. It’s a long way down just to get to Montenvers and even if you’re fast you won’t have enough daylight. So you’ll be navigating the Vallee Blanche at night, roped up, tired... Then walking all the way down to town, even more tired... Or you can ski down to Montenvers in about an hour. Until mid to late March you should be able to ski all the way down to Cham with a bit of walking, so missing the train won’t be a big deal. A better bet without skis would be walking back up to the Cosmiques hut, doing a shorter route the following day and slogging back up to the Midi. Not a bad couple of days but slow and tiring. Whereas with skiing you’d be ready for another day hit the following day.
Skiing is the way usually at that time of year!
Just to be clear, I’m talking about roped up glacier access and descents, not soloing - that’s not something I’d ever recommend on a wet glacier.