This is just a small, minor suggestion. Assuming that NPRs generate with the same government variety options as you do, showing us the government type of an NPR once your relations have become positive enough would be a nice addition RP wise. Not just would it give a glimpse into the society of an NPR, it would also allow for a bit more tactical choice diplomacy wise. Might not want to befriend the fascist NPR empire and their high xenophobia against everyone else.