Hello geoalfio
What about an AG Night for your travel to/from Ticino, and a ZVV travel card for your days when you are in Zurich? I meet a lot of Ticinesi students on the trains on FRI/SUN, travelling with the GA/AG night from/to Ticino.
Or a Half Fare Card for your travel to/from Ticino, in combination with Supersaver tickets? If you know someone else with a GA from Ticino, a GA Tandem Day Pass could also be an option (you must travel at the same time & on the same route).
If you are an ETH student, I think there are further offers, also perhaps with Uni Zurich? Did you already check with the student service?
Kind regards,
Roland