Seeking a fantasy

First time using an alias, because I'm a bit embarrassed/shy about this:

My Mistress (BDSM) wants to incorporate a TS into our play. As a dutiful sub, I've researched and tried to find one who will join us. However, no luck so far. Few will respond at all, and most seem uncomfortable with having a women there. I've tried to stress that she only wants to watch, and make suggestions.

So, any suggestions?