A Swiss government website says this:
"According to the Agreement on the Free Movement of Persons, self-employed entrepreneurs can set up their business without a permanent residence permission (C permit). It is sufficient to have a B permit, which is valid for five years. At registration in Switzerland though, the planned self-employed activity needs to be proven. Proof can be provided for example with a valid VAT number, an entry into the professional register, the registration at the social insurance as self-employed entrepreneur, a business plan, accounting figures or the entry in the Commercial Register."
It would seem that if you presented several of these items that you would be successful:
Page at: http://www.kmu.admin.ch/kmu-gruenden...x.html?lang=en