If you remember in the motorball arc, there's a panel where Alita wanted to change her body to a man's since it would be stronger. But her mechanics persuaded her to keep her female form since it was a draw for the crowd. So it wouldn't be that farfetched that Sechs would want to change genders to ...

http://nipponsei.minglong.org/upcoming/

Hopefully this finds its way to you with the topic being so old and all.