I wrote a thing!
The tale of Dáin Ironfoot, told loosely in the style of a saga of Iceland (in English translation).
Jarakrisafis posted a prompt to LOTR Secret Santa 2023 that said "I remember as a teenager reading the Silmarillion for the first time and wishing there was more about Dàin Ironfoot than was in the book and the appendices" specifying book rather than movie canon.
I read that and thought, ah, what an absolutely fascinating idea! I'm sure I could write that in a few hours! Also, what if I wrote it roughly in the style of an english translation of a saga from thirteenth century Iceland?
Several months later... it's 12,000+ words. Whoops. It will be posted in chapters rather than the whole thing at once.
Dáin's Saga