In reply to cacheson:
> ... "what is the best tool to prevent me slipping in the first place" as a much more important requirement than "what's the best tool to stop a slide".
That is true, which is why these MT Vertige 50cm tools are unsuitable for such terrain.
OP needs a longer axe for easier terrain (unless they're on the short side themselves) where a 'slip' might occur, otherwise they'll be bent over trying to use their Vertige for piolet canne. This distorts your balance and risks your feet sliding out from under you as the weight is not above them.
The Vertige, which I used for years, were fine for climbing steeper snow ice routes, easy traditional mixed alpine routes, and water ice up to WI5. But modern tools are light years better for water ice and steeper mixed routes.
The OP says they'll be on D routes, though, which rules out easy angled snow and ice routes, so the Vertige might be OK for what they aim to do. If they do that...