I wouldn't move to Brazil except maybe if threatened with immediate and acute pain, but find it not very difficult to trade tax free (again outside the usual suspects).
As of trading through offshore corporation, it should work in most/all countries that don't tax overseas income, it is quite difficult for a tax department to know about the shareholding and directorship of such companies, even more about the amount and nature of the profits and where the day to day management is happening, and the less develloped an economy the less tooth its tax department has.
If you really have accounts in 20+ countries and are used to trade trough intricate structures to manage your assets discreetly as you claim you should already know about all this.