Christine I agree and not going to let her do it.
You should definitely not follow your mothers ideas in this and I absolutely agree that you should not accept this.
But what if you find a perfect partner who is exactly how you ever dreamed, except that he wants you to stay belted? Would you do it out of love for him? Consensually, but once you have agreed to it, you wouldn't have access to the key except for emergencies.
If so, you could maybe argue with your mother that it has to be his wish, too and that you don't want to make this aspect the only criteria for finding a new partner but you look for more important values.