Hello, @Resin,
You can rename the child theme, but do not change the name of the parent theme. Check this topic – https://www.8theme.com/topic/failed-to-update-the-update/ You can re-name the parent theme later when work on the site will be finished, but we won’t recommend it because you won’t be able to use auto-update in the future and need to update the theme manually.
Also, check – https://xstore.helpscoutdocs.com/article/108-white-label-branding-plugin
Regards 8Themes Team.