you must be very careful using a agent who gets both stamps in at the same time. It's easy for immigration to pick this up and cause issues. I have seen this happen before.
well I think the US just thought it would be too inconvenient for countries to trade outside the US dollar.
But after what countries are seeing the US do to poor countries by using the US dollar as a weapon to sanction countries, and then hold a coup, these countries obviously want out of this system and opted for trading in local currencies with BRICS, instead of US reserve.
It is far more inconvenient for these countries to be sanctioned by the USA, than to switch trading economy, hence the mass move away from the US dollar reserve.