That can sort of already be done anyway - you can save your character's basic appearance details in character creation to your PS4 or computer and then reload them when creating a new character, thus creating a literal clone (same race/clan/gender/facial appearance/eye colour/hair style/hair colour etc), and then simply purchase a level skip and story skip potion from the Mogstation.

It's a more roundabout way I know, but it's basically the same thing.