Femdom trouple

My sub (m/f 26) and me (m27) would really like to incorporate a third, preferably a dominant woman into our relationship. I am actually very dominant and occasionally hook up with girls on the side, while keeping my sub as a sissy at home. He/she is very feminine and sweet and we could really imagine to enrich our relationship with a little more feminine energy. We have been together for 6 years now and are kind of high school sweethearts, so our relationship itself is very stable and we feel confident to let a third person into our lifes. Interest in one another and sharing intimacy is our main priority as we believe that a healthy dynamic might play out from there. The basic idea would be for me to have a couple+servant relationship as the basic concept. I personally do not have to much interest into bdsm with my GF but rather as a couple bossing around and dominating my sub at home. Just out of curiosity, would such a relationship be interesting to some of the woman on here? If yes what would probably be the best way to find somebody for such a relationship since it is a little specific?