None of the countries will accept the Chinese yuan most African nations will also keep away from yuan as they have first hand experience of Chinese debt traps. The other nations don't have much economy, heck the BRICS group does not even have a secretary like that of G7 for an organisation that is formed in 2009 they cannot even elect a secretary who would take it seriously.
All the founding members of BRICS except India are comfortable with RMB.
Ofcourse a BRICS currency would be better but RMB is also ok.
Reason is all 4 are big producers of agricultural commodities and natural resources( minerals, oil etc ) and China is by far the biggest consumer.
They export food and metals, minerals, oil to China and import manufactured goods in return.
Now everybody and their dog seems to have joined BRICS and many seem to be of this commodity and natural resource exporter only, countries exporting manufactured goods happen to be the W*stern ones or SEAsian ones or China's East Asian brozzers who will not join BRICS.
Anyway BRICS was a meme organization the only things taking it to serious status is the BRICS currency, non Western financial system etc.
Waise there are a lot of WEST BAD cliques out there like SCO and CSTO also, nobody bothers about those.
Anyway assuming this evolves into a serious org in the future, Bharat will play the same role that Turkey and Hungary play today in the NATO
that of doing Ungli to everyone else