I've been doing some research & have concocted a theory that Swarm, Azure & Passenger are Osiris, Isis & Horus of ancient Egyptian mythology. One of them
Azure, I think made a reference to their names being translations & maybe not entirely accurate ones. Azure comes from a French mistranslation of an Arabic word which means lapis lazuli, a stone which the Egyptians believed each small piece of held a tiny part of Isis' soul.
Isis' brother and husband was Osiris, God of the afterlife. One of Osiris' titles was "Foremost of the Domain of the Bee" - Swarm.
In the myth, Osiris was killed by his brother & Isis, his sister/wife, brought him back to life & they had Horus. Horus was the falcon-headed god & in falconry a passenger is "a young hunting bird that can fly and is taken while it is still in its first year", according to the Wiktionary page for passenger!
Together, Osiris, Isis & Horus make the main holy triad of Egyptian mythology. "We are three."
Of course, this could all be clutching at straws & nothing whatsoever to do with the story, but the comment about their names being translations intrigued me! Of course, the Moirai/Atropos link is Greek rather than Egyptian... But then there were supposed to be 3 Fates, not the 6 featured & Atropos was one of them, not the name of the temple but Doctor Who is just fiction & I really shouldn't expect it to adhere precisely to myths that the writers might choose to reference!
I do still want to know why Vinder said it couldn't be the Temple of Atropos - it seemed like he was familiar with the concept at least!