Bison uses CGD, and CGD uses Citi in the US. So that is what makes it much more complex to send a wire to Bison. There are effectively two “correspondent” banks.
So while I have not been able to send wires successfully yet, I tried to use Citi as correspondent (for those US banks that even let you specify a correspondent bank) and then set CGD to be the beneficiary bank, and Bison bank to the beneficiary, and in beneficiary notes used a for further credit to (my IBAN and name). However, none of those wires have reached yet - so take all this for what that tells you 
UPDATE: I did end up getting ALL of the wires to show up… See this post for details on exact information I used to get the wires to work from Chase, HSBC and Vanguard. It did take my sending Nuno all the information for each of the wires, and his operations team doing followup for over a week for them to show up though.