Thanks for the tip with CS. I already have some accounts with them and will look into it. Though without naked short selling the interest to be paid for lending the shares won’t maybe be that much below the put option premium. I also figured IB would allow short selling, but I really have no intention to open an account with them too.
And on the topic of whether this is a good idea: My employers compliance department is fine with it, and my broker indeed knows who I work for. I just have to navigate around all the blackout periods for insider trading (which is another reason besides the saving of a put premium: I don’t like having vested shares that I still can’t sell because of insider knowledge). Also, short selling in general is explicitly allowed on the SIX.