The solution is easy, continue disciplining him, take away all his female clothing (obviously), take away anything else he does for enjoyment, put him in a Muslim school not a public school with a bunch of negative influences, and if need be, move to a Muslim country where that sin is not tolerated where there WILL be punishment for it by the law.
At the same time, if he shows signs of repentance and change then reward him. Take him to the masjid more, read Quran and ahadith more, increase his Iman, etc.
Assuming you aren't a troll. You should also make dua to Allah to guide him and keep him away from that sin.
The Prophet (s) said any male cuckold who imitates women (referenced not exact words), Allah will not even look at him on the day of judgment. and if Allah doesn't look at you, then you are not forgiven, and we know what that means, Allah willing.