It may still be too late at that point. In my experience people who care about a man's hair (women, mostly) see hair loss as a binary thing - you either have a full head of hair, or you're balding. They don't see a guy in the earliest stages of hair loss and say "Oh, he's got a pretty decent Norwood score!", they say "he's bald".

I've known two women that mentioned they'd rather date a man with a full head of hair who shaves his head than a balding man who shaves his head. I pressed it as far as asking "Well, what if they keep shaving it for life?" Same answer.