How much are we talking about? It's not the same to want to change $10,000 as it is to change $1,000,000.
I have some bitcoins that I've kept for a couple of years and I'd like to sell them for a profit, without paying a big tax on it, and then to transfer the money through bank transfer to my country. Here in my country I'd have to pay 20%, which is not acceptable.
To make things legal if you want to exchange large amouts you would need to move to the country you are exchanging the bitcoins in. You should get the tax residence there. Wanting to go to another country, exchange your bitcons for fiat and transfer them by bank transfer to your country doesn't seem very smart at first sight. If you live in a developed country the most likely scenario is that your bank will inform your IRS or equivalent about all the transfers that surpass $3,000.