A bit late to this post, but have you considered singing countertenor? With practice, many AMAB people are capable of singing the alto (or more rarely soprano) line. I used to do this myself as a way of coping with dysphoria and being "one of the girls".

A bit of background info. Sadly, the classical music world is clueless on trans issues so they make a huge deal of "it's a MAN singing like a WOMAN whaaaat". But the point is that a larger larynx can be used to sing in a feminine range.

And my favorite Christmas carol is Bethlehem Down.