To combat the demands to be changed if he pees - make him do it himself. Poops well that is different - better to contain it to just the diaper. But for wet ones - he peed them he has to live with that. It won't hurt him to sit in it for a bit either till YOU are ready to change everyone's diapers. If he wanted a dry bum he knows where the toilet is and could have put his pee in there. It was his choice to use his diaper. A bit of reverse psychology can work on an older child that knows better but is just stubborn. Puts the responsibility for his happiness on his shoulders.