I wonder if it is legal for Voltigo to invest with an offshore discount broker? In many countries it is totally legitimate if you follow all your own country's rules regarding declaring your capital gains & income.
I've written about this one in the Cayman Islands before: OneTradeX.
http://onetradex.com/ I'm not a customer and don't know anyone who is so I have no experience with them; but, from their website it sounds like they might be just what needed by Voligo or other people having trouble getting local access to a discount brokerage. For those who don't know -- the Cayman Islands is the world's 5th largest banking centre.
Offshore Brokerage – Trade 100 Markets In 24 Countries
Direct market access to stocks, options, futures, FX, bonds, ETFs, CFDs and physical gold. Trade assets denominated in multiple currencies from a single offshore investment account.
OneTRADEx offers discount trading accounts for offshore residents and expatriate investors, including non-resident U.S. citizens. It is a regulated broker. Their accounts do require the equivalent of a $5000 USD minimum opening deposit. Cayman Islands would not tax the account and accounts are insured. They note that accounts can be based on any of the following currencies: AUD, CAD, USD, EUR, GBP, JPY, MXN, KRW, DKK, CHF, SGD, NZD, NOK, HKD, INR. The trading software they use is available in several languages.
I see they also offer free demo accounts which could be a good way to see how easy it is and if it is suitable to your needs.