Some movies just can't make it to Broadway--High Fidelity lasted about a week. But, Legally Blonde is pretty fluffy and campy and it could just work. Who knows?
I actually loved High Fidelity. They changed it around a bit from the book, but the songs in it were great. I was singing them for like a week straight afterwards.
the composer and lyricist did some "field work" at the KKG house at USC (California). They themselves went to a university much closer to the Atlantic coast.