Have you tried working with the myswitzerland website?
http://www.myswitzerland.com/en-us/destinations/mountains.html
I typed myswitzerland zurich in google and got to a page that had a map so I could specify parts of the country and then select destinations such as mountains. I got four results. There may be places that are not in the heart of Zurich but might be interesting to explore. Felsenegg comes up.
I have no personal experience with Zurich or its surroundings, but I think the tool may prove interesting and allow you to explore.