I have been attempting to use sunrise.php to override the current multisite blog. I have tried : wp_cache_switch_to_blog( $blog_id ) though this has no effect.
I have also tried everything in https://paulund.co.uk/wordpress-multi-site-nested-paths this tutorial, but I think this is out dated as it using site instead of the blog.
What is the correct way to override the current multisite blog?
Or could some point me in the direction of which core file handles setting ti?
Read more here:: Multisite overide current blog on load of WordPress