I get what you're saying, i just don't think it would work the way you're imagining it.
For fun lets take it as read that it is a 'bilateral screw-deserters initiative'. How do you envision that working as a condition within a peace treaty?
If it is a bilateral agreement do you intend on having the losing coalition somehow enforce the terms on the winning coalition? If it isn't enforced to eithers satisfaction who has broken the terms of the peace treaty?
As fun as i imagine requiring the loser to try and enforce conditions on the winner, i'm not sure if that's a precedent you'd be after either.
Best case I guess would be an unactionable agreement, but that achieves frick all and has no reason to be in a treaty.