You can try it, but I believe that it will make you spend more time than you learn one language for time.

You could to try talk about thing that you like, as sport, some other thing. When do you talk with a native from your language how you talk? I think that you can try to talk about all things that you like and your language partners will can comunication with you.

actually, if you want to have a foreign accent you must to live in another country. While you stay in Brazil, you will not have other accent :) I hope I have helped you. :) I am from Brazil too.