Even with a male-type larynx, you can produce a female voice with the right intonation and resonance.
I've been going to a voice therapist and I've gotten satisfying results. As in, everyone on the phone calls me "Ma'am" before I give my name. Before I did the training, when I attempted to present female over the phone I always got called "Sir." So I must have done something right.
In the transgender activist meetings I've attended, I've been surprised at the large number of ladies who haven't bothered to feminize their voices at all, it seems like the majority of them do not feminize. It was startling when one transitioned woman whose looks were absolutely perfect opened her mouth and out came this very male growl.