I can't answer your questions, but I can say what my experience has been with fighting a receding hairline.
My hairline began to recede when I was 11 years old. By the time I was 12, my nickname at school was Dracula

I started on hrt in my late 20's, but didn't have enough hair at the time I transitioned, so I wore wigs.
Hrt helped stop the recession and undo some of the damage. I was going bald on the top of my head too, and this also slowed once I was on hrt. I took Oestrogen, Progesterone and an Anti-androgen.
After my srs, I moved to just a low dose of Oestrogen. But to try to reverse the hair loss and promote growth, I took Finasteride (Fincar). It wasn't available for hair loss on prescription in my country, so I self-medicate (yep, bad, I know).
Over time, my hair improved to the point where I didn't need to wear wigs any longer.
That was 12 years ago. But I still had the receded hairline, so I had fue hair transplant 10 years ago. This helped, but I found I was still very slowly losing hair, so I tried one of those "light combs" (the one I use is called 'Hair Max').
It has taken a year, but it is finally having a positive effect. My boyfriend and hairdresser have both commented that I have more hair.
I am still looking at one more round of hair transplants, but I'm so close to getting a reasonable hairline.
It's just taken a long time!