I learned that Turso apparently have plans for a rewrite of libsql [0] in Rust, and create a more 'hackable' SQLite alternative altogether. It was apparently discussed in this Developer Voices [1] video, which I haven't yet watched.

[0] https://github.com/tursodatabase/libsql

[1] https://www.youtube.com/watch?v=1JHOY0zqNBY