Hi Joe,
You can force the admins to use the /Data/Sites/1/media folder with this web.config setting:
<add key="ForceAdminsToUseMediaFolder" value="true" />
If the media folder exists you could copy files from it into the other folder they were already using, the delete the media folder, then create an IIS virtual directory at /Data/Sites/1/media that points to the folder they have been using.
Hope it helps,
Joe