MTC-300 isn't an obsolete, but it is in an initial developing stage, then is normal its limitations. Anyway it can be suited for India's needs, but for Brazil needs it is enough to the point our Army has ordered it.
Further, Brazilian Navy thinks interesting the Brahmos. In the last LAAD expo in Rio de Janeiro, I even saw a Brahmos' company stand there. So, if you wants to export your weapons to other countries it is good to do good diplomacy and not to ill speak their weapons.
Rather than buying , it would serve the interests of both countries if they went for joint development of systems.
Brazilian aviation holds more to offer as far as I am concerned.
JV in developing transport planes should interest either countries.
Anyways Brazil has good defence industrial capabilities and one does not need to take online comments seriously, as facts on the ground cannot be changed by people's opinions/comments.
You can post about the many tactical missiles that has been developed by Brazil so that people here become aware of the capabilities of your country.
I believe mar 1 arm was procured by Pakistan.
Also you guys have quite a few JV with south Africa.
India does not have a WVR so it is another area where Brazil has experience and can go into JV for developing such if interest is shown by both parties.