Milord Agree 100%, but for me this open the door to a lot of questions. About key holder interest in keeping his wearer in chastity, the power he had for enforcing it, the means to escape.
Of course there is a lot of room for interpretation. Like when coercion/manipulation start happening? Is the emotional dependence inherent to a parental relationship enough to count as manipulation? How about an upbringing that emphasizes guilt? Repeated affirmations of how much the wearer's chastity means to the keyholder. Whenever the keyholder has a personal interest in keeping the wearer chaste, that is a minefield they must navigate. I do not think I can draw a clear line for someone else there, all I can do is urge both sides to be cautious, like in my talks with people like Jenna.
Another point for interpretation is what constitutes a "reasonable timeframe" for an exit clause? A week? A month? Angelina's "agreement" (which clearly failed point 1 given that the only non-chastity option she had was open conflict with her father) had fixed renewal dates, so it could go up to a year for her. I feel like that is definitely too much, but once again it is difficult to draw a firm line that works for everyone. I would clearly say days or weeks are more appropriate than months or quarters, though.
And of course, no such notice period would relieve the keyholder of the responsibility for the wearer's well-being that he takes on when he (consensually) interferes in their bodily autonomy. If wearing actively hurts the wearer, then the wearer shall not wear.
And of course, all that is with a wearer who believes chastity will improve their life and does not trust themself to do it alone. If the belt is worn for fun or experimentation or whatever, like it is in kink relationship, the last two points simplify to "if the wearer unambiguously communicates that they sincerely want out, they get out". That should be something you are intimately familiar with, @Milord.