So, everyone knows about the Apostle of Peace class, from the Book of Exalted Deeds. It's generally a good, more restrictive version of the Ur-Priest. The Apostle of Peace requires the Sacred Vow, Vow of Nonviolence, Vow of Peace, and Vow of Poverty. I've always thought the class was a bit stupid, because of the restrictive nature of the vows you take.
However, consider what happens when you break your vows:
'If you intentionally break your vow, you immediately and irrevocably lose the benefit of this feat'
The benefit in this particular case is in the description text for the feat. You don't lose the feat, and can't take another to replace it. Since the Apostle of Peace merely requires you to possess the feats, and has no code of conduct requirements, feel free to take the feats to qualify, then disregard them.
Of course, the class is still a horrible investment, due to the sheer number of feats, but this should give potential Apostles of Peace a bit more flexibility.