Is it possible to download rustup components separately and provide their paths to Rustup?

Our enterprise proxy and firewall settings are presenting an obstacle for Rustup's network access. The standalone installation instructions for Rust here come with rustc, cargo, rustdoc, the standard library, and the standard documentation. I would also like to install rls, rust-analysis and rust-src to allow integration with VS Code on Windows. Is it possible to download these components separately, and provide the local filepaths to Rustup?