Cast a film adaptation of one of your favorite novels?

I'm wondering if it wouldn't take another Australian import to create this same energy - Jacob Elordi. 

There's always Paul Mescal (Irish), too... Maybe Callum Turner (British)?

Casting a non-American in an American role is something I wouldn't have thought twice about before pacinoyes . 

So my favorite novel is C.S. Lewis's Till We Have Faces, but it would require casting two fairly young actresses (and one older woman) for the lead roles and I just don't have enough experience with young actors to know. Perhaps someone could offer choices based on my descriptions? Our main roles would be:

Orual - A very ugly - probably deformed - young woman. You will likely need a young actress who is willing and able to act through heavy makeup.
Psyche - Her beautiful, pure sister.
Redival - The other, crude sister that is often mocked by Orual for being a fool.
Orual (older) - She wears a veil for most of her life, hiding her face. This actress would probably be first billed and would be the easiest to cast as a "star." Preferably, the actress would also be very attractive, as one of the greatest moments in the book is a "reveal" of her true face that would work best with a MILF. Rachel Weisz would be my go-to choice for this role.
The Fox - An older, Greek man who teaches the girls in the ways of philosophy. He's meant to be a stand-in for logic and reason over blind faith.
The King of Glome - The father of the three girls, generally portrayed as crude, selfish, and very fearful of the gods.