The two authors I have heard of doing this are Joan Didion (who typed out entire Hemingway novels) and Hunter S Thompson (who did the same, using both Hemingway and F Scott Fitzgerald as models). I always wondered if they arrived at this seemingly not very efficiient method independently, or if there was some antecedent. Do you know of any others?

https://earlybirdbooks.com/books-that-inspire-joan-didion

https://www.openculture.com/2017/06/hunter-s-thompson-typed-...