Changing Single Page URLS with Fixed controllers

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A Client has asked about SEO changes and wants to change the URL of single pages that have been added through a package / single page controller.

Unlike a normal page, you cannot add a canonical URL to it.

What is the process to change the URL. Do I need to reinstall new single pages with new controllers just to do this or is there a way anyone can think of to overwrite it?

Thanks in advance

davidofadelaide