abcdefg you have made a valid point, in fact it's so valid that reducing testosterone is a proven hair loss prevention treatment. Eunuchs have very low amount of testosterone and most of them never lose hair. People that have gone on chemical castration drugs like Androcur, have reported no further hair loss since they started taking Androcur.
Let me talk more about Androcur. Androcur is actually an anti-androgen drug that also reduces ls fh hormones in your body and hence reducing production of testosterone. Androcur has liver heptatic toxicity side effect, but that is not life threatning or unmanageable. When 50 prostate cancer patients were given 50 mg Androcur for 4 years, 28% of the patients had unusual liver enzymes, but none had any liver tumors. The unusual live enzymes were not serious enough to stop Androcur treatment.
For stopping hair loss, Androcur has been tried as a topical and also as an oral regimen for women but not for men, since it reduces testosterone. Finally I would say that YES YOU CAN STOP HAIR LOSS WITH ANDROCUR BUT THERE ARE SIDE EFFECTS DUE TO LOW TESTOSTERONE , EG WEIGHT GAIN, LOW LIBIDO, AND IMPOTENCE AND INFERTILITY. Most side effects should go away after stopping androcur, infertility is questionable.
Im planning on taking a low dose of androcur for may be a 2 years, or longer if side effects aren't bad.
GOOD LUCK