Angelina I don't want to dissuade you from the idea of how to run your relationship or later marriage, but there must be some flexibility in some aspects of the relationship
Sara here: I think it is a bit like with the contracts. We don't need a contract for a similar reason. I trust him that he will see when a change is needed and that he takes what I want into account. I don't think a predefined kind of exit strategy would help us.
I am sure that if I can't deal with the belt anymore, I don't have to worry that he will remove it. I don't have to worry that I risk our relationship if I change my mind about my equipment.