I know you're trying to fire it in your HS ceramics class for convenience, but if all else fails (cf. follow advice in Priest's post first) then just talk to a friend in JC or at the local ceramics studio. (For some reason I think you're in Portland OR. I don't know why. I think it's just association with friends I knew then who did the same thing.) Anyway, an accommodating college student or local potter will be happy to fire your piece in his/her studio's kiln.
And I know I'm speaking the obvious, but hasn't the bong/pipe been the art piece of choice for HS wood-workers and ceramics students since the 60s? It's an advantage in many ways because the teachers are used to it (and did it themselves WAY back in the day) that many turn a blind eye to it or even encourage it. Goddamn, some of those guys who fired or carved their own pieces in the 60s have retired as teachers now. But then DARE happened. Oh yeah…
When you finish you piece, post it if you feel comfortable doing so. I love looking at what people create.
ps. Mista Jeff's got a good idea too, but breaking fired ceramics and maintaining a good edge might be a problem; I don't know. If you need an answer, I'll ask my cousin; she's a prof. potter who started her career making pipes in HS. :D But remind me with a PM if you still need an solid answer.