As I can see, there is no integration between Echo and CentralAuth.
We can notify users that the rename was accepted, declined, and the progress if it's accepted.
Currently the extension send an email to inform the user, we probably can use Echo for that (and force the email type, replacing web notifications)

Notification Request Form

Filling out this form will help developers and product people understand your idea and will provide the information required to implement it. To see examples of the types of answers required, have a look at this sample form. To understand unfamiliar terms, visit the glossary. 

Basic information

  - Purpose of the notification:  
  - Notification name:  
  - What triggers notification?: 
  - "Notice" or "Alert"?:  
  - Notification type (standard, bundled, expandable bundle):  

Wording

For a single message

• Header: 
• Body:  

For Bundled Messages

• Main, bundling message:
• Subsidiary, bundled message:

Links

  - Primary link target:
  - Primary link label (for email display only):

  - #1 secondary link target: 
  - #1 secondary link label:

  - #2 secondary link target:
  - #2 secondary link label:

Icon

  - Icon name:  
  - Link to graphic/example: