In what world is adding a mustache “manning someone up”? Unless we’re looking for mere proof that the individual is not a eunuch, it seems like an odd proposal. It hasn’t been useful as indicator since, well, ever.
Give him a rusty car in the front yard and passion for Nascar that borders on the homoerotic, and you’re all set.
The key is “borders on” higher-ups! Take it from me, I’m queer and we know these things.