From: Esteban Laso, firstname.lastname@example.org
I came across your list of Tlönists and realized it doesn't include Michael Ende. Ende, largely known for his children's novels -- the most famous being The Neverending Story -- makes a homage to Borges in the tale "The Corridor of Borromeo Colmi," which can be found in The Jail of Liberty. (I'm translating the titles from my Spanish originals).
Ende Page -- A small page on Ende from the University of Louisville.
Selected Works by Michael Ende
The Neverending Story
by Michael Ende. Hardcover (October 1999)