Document the changes to the tasks in detail, and send this info to the Administrator. Make that procedure part of the policy that is to be followed whenever a new version of a QV document is to be pushed to production (part of the packaging of a new document release)
As far as I know, there is no method to extract task modifications from one server and send them to another for import without an external sync tool.
I understand that the remote management service in QMC can only import publish tasks. I use a lot of supporting database tasks. I see they are stored in xml files but a lot of GUIDs are in the xml files so I doubt they can be copied from one server environment to another. How can you package the supporting tasks?