Really quite simple since NVM is so simple itself. Just used the standard curl + bash command to run the NVM install of the version of my choice (handling updates will have to come in a later version.) I use the install directory relocation option and that puts NVM into /usr/local/nvm rather than into the user's own folder. Then just source the newly installed nvm.sh file and run the NVM Node.js install command as usual. Voila.