It's not up on AO3 yet, and it's from a fairly obscure older fandom (it was originally published in a zine, just imagine!), but you can find it here: http://asjfans.ashtonpress.net/wilde.htm It's nearly 20 years old and when I do finally put it up on AO3, there will be some edits.

Definitely going to have to read the book, then. Sounds like great fun. I read one or two of a mystery series with Wilde as detective by Gyles Brandreth, but he seemed a bit uncomfortable with Wilde's sexuality and I had lots of other things to read, so I didn't stick with them. I may be being unfair to the way they eventually evolved.