I don't think anybody in BRICS+ has plans to dislodge the dollar as a reserve currency. The dollar's downfall is gonna be commensurate to the size of the US economy. The british pound lost space because it was propped up by taxes and tariffs on India and the US isn't gonna balkanize any time soon. So the dollar will always be a big deal, especially since everyone is so invested in it.
The bigger issue though is that the only country with potential to dislodge the USD is China, and the chinese do not want to do it. China doesn't want speculation, period, much less so foreign speculation on the RMB. China (and the rest of the world) also buys american assets and bonds and profits marvellously from them. The Chinese also has stakes in the current existing trade flows. So as long as the US doesn't worsen political risk, the Chinese have no reason to dislodge the USD. The bilateral exchanges they are setting up exist to fill the void that the americans created. So, of course, with Russia and Iran there will be no dollars or euros traded.
But with other BRICS+ members, the bilateral moves are there more as a sort of contingency: are interest rates too high and must countries save up on USD? Bilateral exchanges like with Argentina. Is a BRICS+ member being sanctioned? Bilateral exchanges can help there, like with Russia and Iran. This means the RMB becomes a trading currency, but not the new reserve currency.
Basically the whole system is working to China's benefit. Why change it? De-risking and friendshoring have been a joke so far and China's manufacturing dominance has only increased in a dollar denominated world. There won't be a need for a new reserve currency unless the US collapses out of civil war or debt.
spoiler
Produced in pretty much any tropical country. There are years when Brazil isn't even the main producer of them (Bolivia edging out). But do note Brazil Nuts are grouped with other stuff there.