Hey Andre, I did an intercâmbio to the Universidade Federal De Santa Catarina last year, and it was probably the best experience of my life. I'd love to help get the Oculus Rift into Brasil's schools if I can.
I don't have a complete answer to your question, but I have never heard of any official Oculus Rift representatives travelling to other countries for any reason other than for technology expositions. I think your best option may be for you or your technology department to purchase an Oculus Rift, and have yourself or a staff member learn how to give demonstrations with it. I can't imagine what the import taxes would be for a ~$BR 800 device, but it might be a necessary expense.
I wish I could help out more, but maybe others will have more information for you. Edit: Eu posso tentar a traduzir ou explicar coisas em português ou pra inglês se você vai precisar, mas meu português é bem ruim haha.