Iv thought about local DHT in females before, to simplify females have approx 20 percent blood DHT compared to men. I agree with your theory inflammation = DHT (due to DHT increasing on any part of body which is 'injured') women also on average have far less deep neck tension so less occipitalis tension (occupatalis directly affects galea 'pull')
So all things considered women have far less scalp inflammation AND far less available DHT, hence far less hairloss.
Balding men have more DHT in scalp than non balding, not sure how men with good hair compare to females in this regard though.
That's my simplified way of understanding things anyway.
Also I'm surprised Botox studies haven't gained more traction in this forum. I assume it's because they state blood flow helps (and any blood flow theory gets shot down on here all the time maybe for good reason) however imo the main reason the botox studies worked was due to this anti inflammatory effect on galea.