If it’s eating your cat’s poo (as opposed to random cats’), is switching to cat food that’s not artificially flavoured an option? As I’ve been told by a dog owning friend that that’s the issue these days, the flavourings make it out into the poo and so it smells tasty to a dog (bleurgh). I know how difficult it is to switch food for a cat though, and how pricey the good quality stuff is.