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I would like to "unfork" a GitHub fork without deleting + recreating it. Is this possible?

My reason is that my project now has a completely different use to the source of the fork, and makes no sense to be showing number of commits ahead, or the pull request button (or at least, with such prominence). With hindsight, I think I would have just git cloned the original, rather than made a fork.

I would like to not delete my fork in order to keep the issues + history of pull requests made.

I am happy to keep the history of commits, it's just the removal of the fork status that I'm after.

Answers

I remember reading about this almost a year ago in one of GitHub's help pages. They mentioned to contact the GitHub staff explaining your situation. The staff will do the needful.

EDIT

After browsing through the GitHub pages list, I see that I was a bit off about the actual task. The page I remembered was Transferring a repository; in particular:

If the transferred repository has any forks, then those forks are associated with the new repository after the transfer is complete. Keep in mind that users who have forked your repository will need to update their remote URLs to point to the new Git repository in order to continue opening pull requests.

It is still worth it to contact the staff with your particular issue and ask them to separate your fork from the network.