Sorry to be a downer, but I really don't think it would've worked. Penny is a naturally funny woman and I don't think her personality would have fit with the tone of the show. Plus she wasn't glamorous enough. I know Kate downplayed her looks but still...
Still waiting for an enterprising retro network to air IT'S A LIVING
Top 10 Shows I Want Completed on DVD: It's a Living, Alice, The Donna Reed Show, Phyllis, Petticoat Junction, My Three Sons, Murphy Brown, The Hogan Family, Julia, 227