Automatically CCing an agent when Agent forwarding is enabled

Hi ZD Community,

Hoping someone can help with this inquiry, and I have not had luck with native functionality.  Please see thread:  https://support.zendesk.com/hc/en-us/articles/4408846792090?page=1#comment_4422848545306

When using the agent forwarding feature, how can I effectively keep the original requester (Agent in this case) on as a CC, once the ticket requester changes to the end user?  What is a good trigger to get this done?

My use case is our agent wants support to work directly with the end user (client in this case) when they forward an email over to support, so Agent forwarding works in that regard, and the ticket requester automatically becomes the client.  However, they still want to be made aware of ticket activity from there on out, so I need something to auto add them as CC as part of the workflow.

Customer support could not give any option to automatically CC the agent, without the agent having to remember to do something ahead of time (i.e add themselves as CC in the email, or use mail API to hashtag a command in the email).  The whole point is this type of change should be transparent.  If anyone has any thoughts, it'd be most appreciated.