I would say that for a chastity-friendly society, we would have to separate the chastity belt from any particular use it might have for someone. Right now, 99% of chastity belts are marketed primarily as BDSM toys, and while there are positive things that can be said about normalizing kinks as a form of sexual expression, the practicalities of wearing a belt, and thus places where society would need to become more chastity-friendly, would commonly pop up in places where sexual expression is not wanted, like public showers and locker rooms, or security checkpoints with metal detectors, to bring up two topics that were being discussed recently. Having the device be seen as a kinky toy is not going to do you any favors if you find yourself in those situations.
On the other hand, we have the subject matter of this forum, premarital use of chastity devices. I do not think we should normalize the idea of parents locking their children into chastity either - Yes, for some people like Ines and her family, that ends up working fine; using modern methods to aid in a traditional upbringing that every party involved is happy with. On the other hand, we have the situation experienced by Lukas and his sister, where zealous parents force something onto their children that they would never voluntarily accept, while not being vital to their health and well-being either. And in some cases (e.g. Lukas's sister), it ends up creating dysfunctional people who never learned self-control because they were driven to grow up with a grab-whatever-you-can mentality. I fear that normalizing chastity would inspire more parents to act like theirs, and increase the soft pressure on kids whose parents already entertain the idea of locking them up against their will.
So I would argue that normalizing chastity should put the spotlight on those devices having a variety of uses. From expressing your commitment to a signficant other to improving self-control in situations where urges are strong. What could help would be celebrity endorsements. From the male football player who wears a chastity device between practice/match sessions because he believes it keeps his testosterone levels high, to the female pop star who proudly displays it as a token of her committed relationship. Schools might mention it in sex ed as a method to make abstinence as a birth control method more effective, and party-goers might recommend it to each other as a way to ensure that their drunk selves do not get up to stuff that their sober selves would not want.
But the message should always be about what the wearer wants to get out of it. Promote starting off by holding your own key and, if your willpower leaves you unsatisfied, hand it over to a trusted friend. Authority figures can be asked to hold keys of course, but it should not be the primary choice. There is a lot of potential for abuse, like a sex ed class in an area where abstinence-only is taught expecting the students to get locked up, and shunning those who refuses to lock up and turn over the key. Awareness and enforcement of consent rules matters, and I think that would be the greatest challenge to make a chaste world a good world.
