Bank account in Swiss Franc for Thai national

Since the prediction for the Swiss Franc / Thai Baht exchange rate is frightening for the end of this coming March 2018, we are consindering to partially transfer our money in Swiss Franc then.

May my Thai wife open a foreign currency account (CHF) with a Thai bank ? Does anybody know what restrictions would apply and how much it would be to maintain ?

The more I think about it this seems to be a good way to "invest" as well if compared to Fixed Asset accounts given the fact that the CHF has always shown strenght in the long run (10 years) towards currencies backed up by a weaker economy.