If you find the word you're looking for, what are your expectations? Will you present the word to these people whom you say reject non-monogamy, and they will say to themselves, "wow it all makes sense now. My attitude is prejudiced and circumscribed. I should change because the way it is now, i am just like a person who is racist or homophobic, and those two attitudes are wrong. I don't want to be wrong, therefore i will accept polyamory the same way i accept gay people."
Is that what you think this new vocabulary word will accomplish?