One small note of caution on that is that up to 08 May, the services are showing as very expensive compared to the rest of the Summer.
From Swiss's previous, this suggests that it is their current planning, but not 100% confirmed.
Also flights are on a very different schedule from March to the start of May, with a very early departure from Zurich and a 08:45 departure back to Zurich and on Sundays's only, reverting to it's normal lunchtime scheduling for the main part of Summer. Those timings preclude connections as there are no scheduled arrivals in ZRH between 23:00 and 06:00, so if they are operating that, they would want to have sold significant seats to a tour operator (which I believe they do for the summer programme).