It seems that I wrongly thought that "instant yeast" was what we call "lievito istantaneo", i.e. baking powder, that would give a a pretty different end-product.
It looks like it can also refer to instant active yeast, i.e. dehydrated beer yeast, that should actually be fine as far as I can tell (I have no idea of exact proportions however).
It looks like it can also refer to instant active yeast, i.e. dehydrated beer yeast, that should actually be fine as far as I can tell (I have no idea of exact proportions however).