It could be totally Swiss, as long as the banks are used to cater to a global clientele first and foremost, rather than lord over Swiss people themselves.
The distributist writers held deep religiously-driven moral concerns about equitable property distribution, so I'm not sure the notion of "yes, we will build our economy around a banking system which helps people from other countries hide their sometimes dubiously-obtained immense wealth and charge them handsomely for the privilege" is really compatible with it.