I'm guessing you will be introducing them to the spoken language?
Yes, I think trying to teach them hiragana would be taking things too far.
Well, what conclusions, if any, have you come to about the language so far in your studies?
Man, that's a pretty tough question.
I guess: It's a beautiful language, but it's also pretty hard to learn (And I haven't even started with the kanji's )
I would guess that a quick explanation and some audience interaction in some kind of skit or game would be the most fun way to present to a group in that age group.