I assume the next version of systemd will include git.

Actually, it's not that bad an idea:

    cd /home/efaref/config/servername
    vim blahd.service
    git commit -m "Update blahd service file to increase widget count"
    git push live master

Then have something else watching the master branch of the live repo do a git pull, systemctl daemon-reload. It doesn't even have to live on the same server. If one of the config files is a puppet script, you can maintain everything.