Just to let you know, I’ve been able to solve this problem thanks to the latest version of the plugin!
Now that shortcodes can be used in the ‘HMTL before/after’ sections, I simply created a slider with just a static image of the banner and gave it negative margins to position it in line with the regular page title bars. It’s a bit of trickery but the users shouldn’t notice any difference.
Keep up the great work!