[brabel]

> some kind of EU analogue of BRICS-for-South-America-but-not-BRICS;

I suppose you don't know this already exits (and has for decades), it's called Mercosul[1].

[1] https://en.wikipedia.org/wiki/Mercosur

[impossiblefork]

Spain is not involved in Mercosur. It's something South American.