OK so this is not a quick fix (and its release day tomorrow so I don't want to land a largish change into nova-cc right now); my recommendation for right now is that you fork the charm and update the template as needed to define the required alias keys; once we have a thought through solution via configuation, we'll land in master, backport to stable 17.11 and you'll them be able to switch back to the mainline stable charm.
OK so this is not a quick fix (and its release day tomorrow so I don't want to land a largish change into nova-cc right now); my recommendation for right now is that you fork the charm and update the template as needed to define the required alias keys; once we have a thought through solution via configuation, we'll land in master, backport to stable 17.11 and you'll them be able to switch back to the mainline stable charm.