Whether a feminine [i.e., nurturing, compassionate, cooperative and socially-conscious] personality happens to bud within a body with a vagina or a penis should be irrelevant.

I can see where you're coming from here, but I think that the work should instead be put into broadening masculinity. To make a loaded analogy, saying "it's okay for boys to act feminine" when they want to do something traditionally female is like saying "it's okay for black people to act white" when they want to do something traditionally european. You can define the words so that the sentence parses, but you can't remove the additional meaning to make the sentence a good idea.

Besides, it's fine to use different words to describe people focused on different things, even if they use the same toolbox.