You're going to pretty hard pressed to do Rust better than Rust.

There's minimal opportunity with lifetime annotations. I'm sure very small options elsewhere, too.

The idea of replacing Rust with natural language seems insane. Maybe I'm being naive, but I can't see why or how it could possibly be useful.

Rust is simply Chinese unless you understand what it's doing. If you translate it to natural language, it's still gibberish, unless you understand what it does and why first. In which case, the syntax is nearly infinitely more expressive than natural language.

That's literally the point of the language, and it wasn't built by morons!