OK, thanks for those answers.
I really wish you luck, but I hope you know that the odds are stacked against you. What you are looking for is commonly known in poly circles as a Unicorn - usually as a reference to it being a mythical beast. I have known people that have searched long and hard for something like this and never found it.
One thing you might want to consider is relaxing your requirements a little - maybe not have the goals of a "live-in" or maybe possible to have a relationship with just the one of the pair. This would increase the size of available dates quite significantly. But I recognize that it might not also satisfy your bottom-line needs.
Good luck on your search.
"Listen, or your tongue will make you deaf." - Native American Proverb