As I said earlier, I think the only way for you to do this is to look for a 'normal' job and escort independently on the side. Hope you manage it
I agree, you'd need to come here to work in a straight job and try to sort your immigration that way (and they often want you to work as something that will be of benefit to the UK, so to have transferrable skills like dentistry, nursing that kind of thing) then escort on the side and declare yourself part time self employed (I'm not sure how hot immigration is on that, so I would also speak to an immigration lawyer if you get here then want to do that, because you don't want to end up being sent back).
Good luck, it's definitely not going to be easy for you to try to do it this way but everyone should be happy so I hope you are successful.
Oh just a quick ps. I have friends from all over, and I know that quite often the UK and other such countries are given a twist like the streets are paved with gold, they aren't. It's far from easy here. I'd read alot if not all of the threads on here as well as lots of information on life in the UK and particularly the cost of living. I can only talk about the escort side of things but you'd be a very niche market, so you'd need to tailor your advertising and make sure you were doing the right things to capitalise on that.