Usually banks are not charging retail clients for negative rates, at least not initially. Experience shows that there may be an end to banks' patience in this respect (most banks in Switzerland are charging negative rates now, but that is after 5+ years of negative rates).
In the end, what is the difference if you get 0% or -0.5%? I understand it's a big difference psychologically, but not at the end of the year. And you can always rent a bank safe and deposit your cash there.