Is it possible to install node-sass without downloading from Github during the post install step?

I'm behind a corporate firewall, proxying the npm repository with Nexus. During the post install step, node-sass tries to curl from https://github.com/sass/node-sass/releases/download/v3.10.1/linux-x64-48_binding.node but fails due to the firewall. Adding a firewall rule to let the request get through is not an option. If it's possible to also proxy Github through Nexus, that may be an option but I haven't been able to get that configuration working when I've tried. This is also for a Jenkins build, so having the developer do a `npm rebuild node-sass` after the failed install is not an option. I need the install to work, or the Jenkins build will fail. Is there any way to install node-sass from just the npm registry without also having to download anything from other sources during the post-install step?