Barbara Harris' career after APPLE TREE only consisted of doing films for people like Alfred Hitchcock, Robert Altman and Francis Ford Coppola. More recent credits include "Dirty Rotten Scoundrels" and "Grosse Pointe Blank".
I've never been the biggest fan of The Apple Tree. I always thought they should've just taken the third act and turned it into a full musical.
That said, watching Chenoweth transform from a chimney sweep into a glamorous movie star would be delightful. Even so, I really don't think the show has the appeal to do well in a revival, even with big stars. It's just too odd a piece.
It is so out-dated, I dont think it will be done. If they re-do the book BIG TIME I can see it. One of the reasons its so forgotten is look at the other musicals that opended that year https://www.broadwayworld.com/tonyawardsyear.cfm?year=1967
Just so you know, I had alreaedy PM'd jasobres, about this, and have not heard back from him, but i am a person of my word, so if it comes back, in fact i will leave.