I see.
Not sure I can bring any added value to you. I think that you could probably live first in a country that would not question much where the money comes from, but have good international reputation(Sg? Or others?), bring all of it on onshore accounts, trade for few years, pay income taxes on your trade profits, then ONLY would go back to Europe with all the money.
Actually, I intend to go back to Europe in the future. So even though I could optimize to pay a lot less taxes in Sg (no tax on capital gain with a very broad definition of capital gain), I don't try it so when I go back to Europe, all the money is official and properly taxed so my European country doesn't try to cheat me around.