1. This is very unusual proposal,
2. In normal course of action you are not supposed to mistreat anybody leave apart your wife,
3. Should you ever mistreat anybody, you will be subjected to be punished depending on the level and degree of your mistreatment, if proved before the Court,
4. You are not required to give in writing that you will not mistreat your wife and if you mistreat, you will be punished even without any such agreement,
5. Please note that even if you change the style of your signature or sign with your left hand, the forensic test will be able to establish that it is actually your signature,
6. Only way out in this case for you is not to mistreat your wife.