Nere would be the absolute worst to be added as a companion since Minthara already exists. Not to mention that it'd be the exact same repetition of the situation as it is with Halsin and Jaheira. So instead of 5 Elves, we'd have 6 Elves when the whole point of the OP's topic is the severe lack of racial variety, and more specifically the entire lack of tiny races.
I honestly would rather have Larian go crazy and make a Goblin a companion, like Sazza for example. A backstabbing little rat that owes her life to the player three times over. Now wouldn't that be something to have a completely unique race as a companion which would also give insight into the Goblin culture and way of life.