Late to the party here, but if you want something hardcore, I write epic fantasy gay erotica. My series Enchantment sounds like it'd be right up your alley, but you might like this one as well.
> What does a novel look like that depicts ALL of its characters and cultures as un-gendered? The entire work, including its use of the English language, is built from this concept.
You've read Anne Leckie's Imperial Radch trilogy, starting with Ancillary Justice, which made a clean sweep of the Hugo, Nebula, and Clarke awards when it came out?
(The Radch' language has no concept of gender: by default Leckie uses "she/her" for everyone (and everything -- including the living starship at the centre of the story, Justice of Toren.)
I'm going to suggest a look at Alexis Hall's work, starting with The Affair of the Mysterious Letter, which is kinda-sorta what you'd get if a genderswapped and very lesbian Sherlock Holmes novel got it on with The King in Yellow: absolutely bonkers and an absolute delight to read. (Hall works in LGBT romance as well as urban fantasy; this is at the less romance/more stabby-with-tentacles end of their oeuvre.)