I get your Idea but I'm keeping Sam Rami because his future projects show he can do Fantasy and Strong women however because of her involvement with Supergirl Mia Farrow is not brought on as writer of Red Sonja but Comic book writers Gerry Conway &Roy Thomas who created Sonja and wrote the fantasy film Fire & Ice were also brought onThe more I think about it, I not sure that Rami is the Best choice for the Script.
Andrew Offutt wrote the War of the Wizard trilogy about a Strong Female Redhead character in the early 80's. Have Rami bring him over to work on the story.
Another two fantasy writers who might be brought in are David C Smith and Richard L Tieney who wrote the Red Sonja novels in the early 80's. And Teney had finished some of the Robert Howard Stories and Smith had written a novel "The Witch of the Indies" with Howard's Black Vulmea, a Strong Female Pirate.