I have a similar situation at work. What about making this script more generic, factoring it out into its own repo and referencing it with Git submodules or SVN externals? You could also think about turning it into a proper plugin for the package manager.
To paraphrase Jamie Zawinski: Some people, when confronted with a problem, think "I know, I'll use Git submodules." Now they have two problems.
The real issue is finding a home. Someone's personal dotfiles aren't really usable, maybe https://github.com/tj/git-extras or some project along those lines.
