I would do it this way using Server URL, call analysis prompt and couple workflows:
1- Set up a server URL to your assistant to get the status-update data (Includes the control URL for injection)
2- set up an analysis prompt to catch the forward destination
3- Set up a workflow to save the summary with the phone number associated , somewhere accessible for the next workflow
4- A workflow that triggers when call starts with status-update , to inject any summary associated with the calling number
in the injected prompt you can then call the forward function directly to the last destination ..
This will work directly if you don't have a 1st message set up, if not, it will execute after the 1st message ... I hope that helps