Great, I cant help you too much about all these buroucratic stuff of convalidation and documents but if you need infos about aviation in brazil you can ask nad ill try to help.
btw, i talked to that friend of mine who had his hours denied by Tam and he explained that the reason for it to be denied was because TAM requires these hours logged in U.S to be validated by FAA and ANAC as well, if youre able to do that it can be accepted by them