I keep corydoras with all my OZ and PNG native species, including blue
eyes. I find these fish (corys) to be as peaceful as one can imagine
and have never had any difficulties at all.
My collection of blue eyes is limited, but include p. furcatus and p.
gertrudae, one of which is a hardy species you mention. I can't imagine
corys being incompatable with any blue eye except perhaps those which
require lots of salt in their water.
I am also interested in seeing the responses to your post, as I hope to
soon be expanding my collection of blue eyes.
Jim