Shave a few hours off the total trip time, and it WILL be a winner.
When these "into-wind" northern winter proposals have been explored before, it was apparent that most of todays aircraft would have to fly at max range cruise speeds in order to arrive with the appropriate reserves. At these speeds it meant the time lost over 7000+nm equated to around 45-60 mins, negating the time saving benefit gained by operating non-stop with a lesser payload to accommodate the extra fuel.