Well, I'm not sure where you live, but you might want to see if you have some sort of active poly group on your area. Most poly folk aren't fully "out" to either family or work, and so understand the need not to be walking around with a neon sign over their heads. They would also be a group that you wouldn't have to explain the concept of polyamory to.
"Listen, or your tongue will make you deaf." - Native American Proverb