A lot of Wikipedia articles Ive read use a persons current name, and typically mention their birth name in the opening of their early life.
Celebrity Y was born as Average Person X in Flushing, Queens...etc etc
Seems like a fine enough way to do things.
Specifically with the Bruce/Caitlin Jenner things, it may be useful, in the context of history/education, to have a quick aside. They participated as a male under their birth name, Bruce Jenner or something like that. If only to make it more easy/convenient to research/find contemporary sources that may not have had their meta-data updated. (Such as an old Olympic video that still refers to her as Bruce)
...
that all said, this isnt something Im especially invested in. So if historical writing etiquette moves to expunging their AGAB then Im not gonna lose any sleep.