Cheers Rob, and thanks again!
Geoff, something you should take into consideration - any observing of the Sun comes with risks. You should prep your students in the dangers of observing the Sun directly, which can lead to severe eye damage or blindness without suitable solar filters. There'll always be some clown who wants to use the "spectroscope" as a telescope! It's all about safe observing by indirect means (reflection of a tiny portion of the Sun's light and splitting that into an observable spectrum). No doubt you already have that in hand though.
Good luck with it, and I'd love to hear how it all goes!
Cheers -