You don't need to arc-mutex an mpsc. On the sender side, clone the sender as many times as you need and pass it by value (each sender owns a clone). On the receiver side you must have only one (mpsc is multiple producer single consumer) which is owned by the receiver.
I'm just mentioning it because I think that toilet paper as a single use item billions of people use at least daily is a much bigger issue of wasting trees than books - which last for decades and are very useful
There are modern toilets with integrated automated bidets and dryers. But they are unfortunately a bit expensive.
No you won't. You have no idea how utterly inhumane US prisons are.