What about a "cross-over" recording of CHICAGO? You know, where opera singers record Broadway scores (They did it for CANDIDE and KISMET, just to name a few).
I'd suggest Marilyn Horne as Roxie Hart, Joan Sutherland as Velma Kelly, Luciano Pavarotti as Billy Flynn, David Daniels as Mary Sunshine, and Samuel Ramey as Amos. It'd work!
"Long live God!" (GODSPELL)