Thats unlikely to be a massive casting option because fuckability is still a factor. Very few actors are given or can carry character roles which has no sexual tension or relationship conflict element and are box office winners. So a male even with the best plastic surgeon's is going to have a limited role offers.
Don't know you saw Inventing Anna, but Laverne Cox* took the role of a biological female who exists in real life, and was the only character that was shown having a sex life/being overtly sexy. Perhaps as long as biological female black actors are the only ones missing out on such roles, the likes of Watson can bask in the glow her industry's "inclusivity".
*Another terrible actor, but then I suppose they have a double acting job to do.