Rejoice, if you look at the repository you'll see that's exactly what they're do...

		nieve on July 17, 2017 \| parent \| context \| favorite \| on: Remacs – A community-driven port of Emacs to Rust Rejoice, if you look at the repository you'll see that's exactly what they're doing - replacing the runtime/C underpinnings and keeping the elisp.