Frenchie Davis played Effie already and was surprisingly underwhelming. Fuschia Walker was an AMAZING Effie, but I fear she's a bit too old for the part now.
I could be wrong, but I seem to remember a sight gag having to do with Effie's size in the scene where she discovers she's been replaced. In the dressing room, she opens a door or a locker where her dress should be hanging and there was a tall thin version of her dress there, which was too obviously
not hers. Am I totally off here? It was a while ago, but I just remember that so vividly and her reaction, coupled with the audience reaction, added so much incredible tension in the moment that fueled the following iconic scene and song. It was one of those indescribable funny/not-funny moments which was pure genius.
"What can you expect from a bunch of seitan worshippers?" - Reginald Tresilian