Stephanie Rothenberg is the first cover for Rosemary. I know Cameron Adams is the second cover, but I think she may also be the first cover for Smitty.
I imagine Megan Sikora is both the first cover for Hedy La Rue and the second cover for Smitty (if Adams is the first.)
Based on what I know of the rest of the cast, I'd also venture to guess-
For Finch- Barrett Martin, Ryan Watkinson For Biggley- Cleve Asbury, Joey Sorge For Rosemary- Stephanie Rothenberg, Cameron Adams For Hedy La Rue- Megan Sikora, Erica Mansfield For Smitty- Cameron Adams, Megan Sikora For Miss Jones- Tanya Birl, Paige Faure For Frump- David Hull, Ryan Watkinson For Twimble/ Wally Womper- Kevin Covert
Tonya Pinkins: Then we had a "Lot's Wife" last June that was my personal favorite. I'm still trying to get them to let me sing it at some performance where we get to sing an excerpt that's gone.
Tony Kushner: You can sing it at my funeral.