Huh. I guess the bar scene is just really not the way to go in this scenario. I would agree with the other posters that you might do well to 1) focus on forging new friendships rather than finding new sex partners (I've met lotsa people I ended up getting involved with as friends first, or through friends) and 2) to loosen up your ideas of what you're looking for and consider dating separately and letting a three-person situation find you if it finds you. It's a nice idea, but there's a million and one problems with setting out with that as your only goal. It's a lot of pressure on any new person to feel like they need to like both of you equally.
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.