Is it possible to move the header a bit lower, so we can have a part of the hero image showind above it?
Something like merging the header with the content and giving the header a top margin
Just omit Point 6 for disabling the site header. You can then adjust the header padding in the customizer to create some space. And make sure the primary nav is located below the header. Should work π
Just came back to that project and writting to confirm that it can be done the way you described.
No css at all were needed. You can check yourselves the result.