Grr, off topic, but my school is doing Guys & Dolls in spring. We have the same situation you do, lots and lots of talented girls but maybe 5 guys. The people doing the musical (who aren't connected to the school) have been warned several times, but they don't want to accept that it will be impossible to cast Guys & Dolls without any guys.
I was trying to convince them to do Pippin. There are several guys in that show as well, but if you cast the Leading Player as a woman (my preference actually) you have Pippin (lots of singing) the King (one song) and Louis (no singing) and maybe a couple other minor male characters.
Good luck! Trying to run a high school drama program sounds awful, but keep it up!
"The art of Illusion is the art of love; and the art of love is the blood-red heart of the world." - Tony Kushner, "The Illusion"