Wow, it sucks that you're getting those reactions. I assume the women you're approaching know your situation right from the start? Have you tried searching specifically for women who ID as poly?
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.