Building on my base collection for updating collections (very meta), I created a new one that will update the host, path, and query parameter key, value, and description. You just need to add a collection id (which you can get from URL and from info tab), and enter values for the query parameters find and replace. Then run, find and replace the value you are looking for, and then it will save via the Postman API—adjusting your original collection.
You can view the documentation for this collection in the collection public workspace, where you can view the docs for the collection, fork and use the collection in your own work, while also commenting on the collection, providing feedback on where I should be taking it next. The collection documentation should provide you with all that you need to get started. If you have any questions that you don’t want to have listed in the comments feel free to email me at email@example.com and I will do my best to answer your questions.