I would agree, you can recast both roles. I think people in general freak out too much about recasting these days. Look at Marvel, they are being very cagey about recasting Kang. There are rumors they are completely changing their whole slate of movies rather than recast. They recast the Hulk with no problems. They even had a show where a variant of Loki is a woman, so they can't do the same thing with Kang and state this variant looks different?