I tried Elle Lush as her website specifically says she can do scat. She was very fun and a cool chick, but unfortunately she wasn't able to go. She used suppositories and it didn't work, and even if it did, the use of them totally killed it for me.
I also tried Dolly Debauche and she couldn't produce either. She went out the room, did an enema to try and move things along, and then came back and let go in my mouth. Which I wasn't expecting. LOL. It was just water and didn't have any in it.
I think we need a specialist dominatrix for this service. I think escorts may not be the best choice. I think maybe if they offer anal sex then they are used to cleaning out before a session, and then when they get one of us freaks who wants it dirty, it doesn't work.