Just to add to the discussion – someone has created an add-on for Beaver Builder to turn off the standard header/footer (either or both) and replace it with a beaver builder templates.
Plugin Name: BBPlugin – Header Footer Templates
Plugin URI: https://j7digital.com
Description: Adds a panel to the Theme customizer to insert a layout as a header/footer globally on each page.
Author: J7 Digital
Author URI: https://j7digital.com