Hazel, you appear to think that the reason there are no trans women in Afghanistan is because it's not safe to be trans in Afghanistan, right?
So trans women in Afghanistan are forced to present as men in order to avoid persecution, right?
The thing is, Hazel, it's not safe to be a woman in Afghanistan. Women in Afghanistan don't have access to education or healthcare. They're banned from talking outside their own homes, from singing, from standing near windows in buildings where they might be seen from the street. When they are allowed out they must be fully covered from head to toe.
Do you not think that if they had the option to put on a pair of trousers and suddenly be indistinguishable from men, they would take it in a heartbeat?
But they don't have that option. They cannot disguise themselves as men and live as members of the ruling sex class. Because they are women.
Trans women in Afghanistan, if they exist, can disguise themselves as men to escape oppression, because, well, they are in fact men.
Being trans is a choice that some people make, mainly in countries where being trans is not actually dangerous at all. If you exclude Brazilian sex workers from your analysis (and possibly even if you don't exclude them), all the available data shows that trans people are less likely to be murdered than any other group.
Being a woman is, unfortunately, not a choice, and is dangerous everywhere.