You might be able to use the LocalSet (https://docs.rs/tokio/latest/tokio/task/struct.LocalSet.html https://docs.rs/tokio/latest/tokio/task/struct.LocalSet.html

You might be able to use the LocalSet (https://docs.rs/tokio/latest/tokio/task/struct.LocalSet.html https://docs.rs/tokio/latest/tokio/task/struct.LocalSet.html) to run !Send futures on a single thread.