Hi Patrick,
I’m not 100% sure that would help, the problem isn’t to set the currency the problem is that if you have a Braintree account with multiple currency support you need to be able set your Merchant Account ID in the plugin so you connect that site with the right currency in your Braintree account. Actually I think this would be pretty easy to add to the plugin just by adding this field, instead of the “auto” connect. Maybe just by adding an “advanced settings”-option for API-settings.