Yes, it's doable. As you can see from the diagram, the higher number platforms are actually under the lower number platform. But, whilst the platforms are clearly signposted, I wouldn't recommend something so tight to a visitor unfamiliar with the layout.

There are so many trains going from ZRH to the main station (and many of them which stop on the higher level platforms which would be a short easy stroll away) - why the need for such a tight connection?