You may be also interested in the many existing teaching resources published by non-language-designers (whatever that means for a community-driven project like Rust), such as Rustlings and Rust by Example at https://www.rust-lang.org/learn if the book doesn’t satisfy whatever criterion you think disqualify it. Some of it is published via the rust-lang.org website, but it was/is maintained by different people who work on the language, compiler, std lib (etc). The project has a large number of people across many teams: https://www.rust-lang.org/governance