Hi Jamie,
You will not be able to open up a joint account with your wife in a Brazilian bank. Current Banco Central policies do not treat foreigners without a permanent visa kindly.
If you have a permanent visa and try to appeal to the common sense of the local HSBC branch to take you in as a client based on your income and assets outside of Brazil... you are also out of luck.
Try Bradesco or Itau. These two banks might take pity on you and take you in with no or little Brazilian side documentation
Regards,
Boris
P.S. Stay away from Banco Santander, they are having some major problems up in the North East.