You understand, I hope, that while you can think this you would never do it, nor will such a punishment ever be done in a civilized world, but the idea may well appeal to just those types who are sick enough to rape a child. It is for that reason and others like it, that while I have a great imagination, your suggestion being one of many similar that have crossed my mind, I never ever express them in public or put them out there into other people's mind just to be sure my own imagination doesn't slop over onto those who may be insane but have none.
Also, I hope you realize, the all the fervor you feel that such a person deserves that, is the same fervor that drives the insane. You may not know it or integrate it into your thinking, but the need the insane feel to do violence is because the violence done to them as children is what made them insane. You are proposing violence and suffering and pain as the remedy for what they have caused. That itself, is insane.
You have to understand that all you can do with your pain is to suffer and die on the cross. Do you understand that a real man, a real person who wants to bring love, can only give love for hate? Everything else just creates more karma.
The truth is very hard to take. It requires that you die to your own hate. You can see, I think, how you love your own hate by how you feel it's justified. It isn't, however, sorry.