All that legal stuff aside, the Dear Rich staff would really like to see you make this musical. It seems like a sweet idea and could be very rewarding. So what's a music director in a tiny K-8 school supposed to do? It reminds me of the time my mother called a big music publisher lawyer and asked for permission to perform a song at a nonprofit benefit. The lawyer's response: "As far as I'm concerned, I never got this call." In other words, when a copyrighted tree falls in the forest, sometimes nobody hears it. That appears to be the approach taken by some musical directors.
It would be unwise and unprofessional to advise you to go ahead without permission. However, should you choose to assume the risk -- and it does involve some risk -- you can lower the odds of seeing lawyers on opening night by doing the following: