[powerlifter]

Let me start out to say Snimon makes some very good points. A International card may be what you need. There is a swiss local card that is called Orange click. It has free roaming in the countries you are going to be in. You have to pick the cross border option. The only drawback is it has to be sent to you in Switzerland. I think they will send it to your hotel they do have to have Your passport information when you receive it. You have to order it online that is the only way you can get it. AndreA may be able to shed more light than I on this. This is of course another option for you to consider.
Have a great trip.