Instead of creating a new title, porting over a user's existing stock, and then deleting the old title, I think that there might possibly be another way to accomplish the same thing.
CB could issue a program update that (for example) looks to see if the user has the title Star Wars (1st series) in their database(s). If they do, the update says something like: "This update will rename your existing title Star Wars (1st series) to Star Wars (1977 series). All of your inventory and issue data will be preserved, only the title will be changed to match to master database. Click "yes" to continue. If you click "no", this update will keep your existing title and create a new, separate Star Wars (1977 series)."
For the users that click "yes", the updater will execute the "Modify Title" function to change the series title to Star Wars (1977 series).
I imagine that something analogous could be done to change the Media Category for titles as well.
I believe that the weekly content updates only import data into your database, so this kind of solution would almost certainly have to be done via a program update.