Site wide Search and Replace for new user

Hello,
All of my subdomain sites on my multisite network have links like this example: http://www.website.com/?Id=XXXXXX on various pages, posts and widgets. Currently a new user has to manually go through the pages and replace the XXXXXX with their ID#.

Is there any plugins available where the new user can do a Find and Replace of their subdomain site and replace all XXXXXX with their ID?

Thanks, Chris