It's safe, legally, just about zero chance of extradition even if the yanks ever wanted to get him in a criminal court. More problematic with having a prying press and others who will follow his every move. As you say, he's short of brass, but I suspect charlie or the bald one won't be as keen to fund him living his lifestyle if he keeps swanning around and showing them up over here. Perhaps they'd like to give him a 'settlement' and kick him out? All dressed up and rerouted so it isn't called 'prince nonce settlement from the public purse' of course.
I was about to say the nonce will have run out of money raising options after a trial, assuming his mam is dead by then. Same time, there's always some business cunt/newspaper publisher/UKIP 'grandee' who will step forward to amaze you as to the depravity of the human soul.