There should be exactly zero male guards in a women’s jail.
Lewis gets pulled under the “Christian” umbrella far too often. I mean yes he was a Christian but wasn’t a far-right nincompoop either.
Both he and JR Tolkien were contemporaries who shared a faith. The main difference between the two was Tolkien specifically didn’t write allegorically while Lewis did.
Hire more female guards.
There is no way there wouldn’t be enough unemployed or underpaid women who wouldn’t work in a women’s jail as a guard, if for no other reason than the pay is far better than working at some burger joint for peanuts.