I have just purchased a licence to Fluent Community and look forward to providing training and collaboration for clients
Although I believe I will be able to embed content other than videos (e.g. H5P) I hope the course element will be developed to provide richer native features e.g. quizzes.
Shortcodes are not supported at this time. So I doubt you will get H5P in your course content at the moment. Shortcodes will be supported, we just don't have a timeline Yet.
Curious to hear what you are planning for your FC portal for clients. I would love to do the same Nicholas Birch