I'm considering pitching a package that wraps SQLite's C APIs in a NIO friendly API. This package is called SQLiteNIO.
It has a very similar user-facing API to PostgresNIO but what it does internally is much different. Instead of using a wire protocol over TCP like Postgres, libsqlite is in process and offers a blocking C API. This package puts all calls to libsqlite on a
NIOThreadPool and then dispatches back to the event loop as needed.
If the working group / community seems interested, I will do a full pitch / proposal for this.