> I had actually wanted to make a new GitHub account for the project, to separate concerns...

Are you aware GitHub lets you create organisation accounts for collecting projects behind a common name? I think it might be what you were looking for. You can even turn your current account into an organisation.

https://github.com/settings/organizations

Skull emoji. Why the heck didn't I do that? Trust me, we're all learning.

I'll make sure to do that though as the next step.