Your best best is probably either the on street suggestion, or pursuing the idea of contacting estate agents managing the bigger buildings in the areas, depending how far you are willing to travel and how much gear you’ll be lugging.
In the building I just moved out of they were renting spaces at around 170 frs a month, and they had a few as there were about 60-70 apartments in the complex. However, I reckon that anywhere near the airport (I live in Lausanne), you won’t have been the first to come up with the idea and the premium will be high. It can be hard to get estate agents to respond to you even if you are looking at sending a lot of business their way here in CH, but persistence or a phone call normally does the trick.