@regis Ah yes, it looks like the WordPress/Moodle/Drupal plugins don’t actually require self-hosting H5P itself. Instead, adding these plugins to a Wordpress/Moodle/Drupal installation will connect that installation to H5P’s content type hub and integrate H5P content creation into the Wordpress/Moodle/Drupal authoring workflow.
Based on that (and the fact that each of these systems seems capable of acting as an LTI provider, cf. [1], [2], [3]), what you’re proposing might work. We haven’t had a chance to test this approach, though – let us know how it goes when you do? 