Clearly this is not the route choice you would take if you had stable slopes and a good forecast. In the event we had a howling N wind and temperatures that were -17C in the hut in the morning, so inevitably digit-threatening frostbite conditions. We were keen to keep moving, hence positioning ourselves in this way to Ollomont, to enable an excellent mountain day, the following day. By preference you would take the route, well described elsewhere on FATMAP, from the Grand St Bernard to the Valsorey Hut, from where you are into the standard Haute Route. Fit people can then easily link the Valsorey to the Vignettes Huts. Indeed, with the Chanrion Hut closed, it has been commoner to do this recently. The Chanrion Hut is being renovated, so hopefully will be open, giving another accommodation option, from spring 2021 onwards.