I wouldn’t underestimate the kids listening to her. I used to work in a petting zoo, and when there is a stranger telling the kids what to do, they listen. I think it would be okay if the bunny is pretty outgoing and comfortable with new environments, but don’t attempt it if you have a shy/skittish bunny. I think my buns would be okay with it, just make sure to tell the kids no touching, and to stay calm and quiet. As a kid I remember lots of visits while in class/at camp where someone would bring in animals to teach children, and beside the occasional scared and loud kid, most children tend to appreciate that sort of interaction and don’t want to it.
Basically, if you think your bunny can handle it, make sure there are strict rules for the kids explained before they see the rabbit like no loud talking, no touching (unless you feel that a you bun can handle a couple gentle pets at a time, always use the 2 finger pet rule), no quick movements, and to remain sitting. Stress that you don’t want the bunny to be scared, otherwise you will have to take the bunny away.
Also I like the idea of printing out pamphlets with resources for information on rabbits to pass out to kids is a good idea, they can give them to their parents who will either be put of from the idea because of the amount of work, or perhaps willing to take on the challenge, in which case a couple local rescue contacts would be nice to add as well.
Good Luck!