Tbh, I'm not a big fan of attempts to create a BRICS currency either. The economic conditions across the BRICS countries are too different for a common currency to be adopted for domestic transactions. And if this common currency was only limited to international transactions, you would still recreate the problems of the gold standard (a hard limit on the availability of money for transactions).

I think the correct approach is to facilitate both easier transactions in local currencies and cross-border bartering of commodities. The former allows countries to take on a level of "debt" through net imports according to their needs, the latter allows material production to dominate financial constraints.