... I can't say I don't enjoy being Kaitou Kid. That would be like Hattori or Kudo saying that they don't enjoy being detectives.
But I can say this much: if it were only fun and games, I wouldn't have to worry about being found out. It would hurt Isabelline, since she hates Kaitou Kid so much and her closest friend being the person she hates... but dealing with that, dealing with the possibility of prison... that's not as worrying as the more deadly possibility.
Not to say I'm not selfish. Though I'm thinking it will be inevitable in this place that she will find out. I would just prefer it be me to be the one to break that news.