@jac
Realistically should an installation of wordpress be on a sub domain or can it be placed in a sub folder?
It should be in a sub domain. Whilst subfolder installations will work for the most part, you’ll have issues attempting to route traffic destined for the WordPress folder as NodeBB will consider this it’s traffic and try to route it internally.
And I’m also hoping nodebb supports scope for something at the bottom of articles to say “why not discuss this more in our forum?” Something along these lines.
That should be the other way round, no ? For example, “discuss this on our forum” should be in the WordPress site as otherwise you’re already in the NodeBB site