@WingsOnFire I would believe if it was one of those laws that end up not being thoroughly enforced. Around where I live I know of at least one dwelling that is totally off grid and self built, where a family of four used to live for around two decades. I know that it was not legal for them to live there, and they would not register with health centres in order not to be spotted etc.
@Stahlmann, I actually think that what 2b1s was suggesting might just be the best way to find out.
@Jean, cool I am going to keep this in mind. I have read most of your journal in the meantime, good stuff! We likely will never be FI for Switzerland's standards, so if ever move there will take you up on the offer of suggesting some potential job providers ha!