If you do your training in the US and then convert in Brazil, it will still take you less then do all the ratings in Brazil.
If you know how things work and get help from somebody that already did the conversion in Brazil it will go faster.
I did my FAA ME CPL in about 8 months and I was lazy, saw peoples doing it in 6 and be a CFI in a total of 8.
in one year from now you could be sitting in Copacabana with your Brazilian CPL, the CFI you will have to get it there, you don`t need to take ground school, it`s really easy the test, INVA part is a joke, then some aeronautical knowledge and a boero test, after that you fly 20 something hours and you get the "CFI".