@shtwzrd @daviwil Indeed, it’s really tricky: now that core packages like librsvg (and soon Linux) depend on Rust, you can’t just move Rust packages out of Guix.
The same goes for most language packages. For example, Pandoc is used by a variety of packages, and it pulls in lots of Haskell packages.
CRAN and Bioconductor might be good candidates, but then the difficult part would be dealing with compatibility and ensuring interested parties have a say.