in RISE - Insert storyline block from external Review site?

Is it possible to insert a storyline block published in a review site that is under a different account than the Rise account?

I develop in storyline and have a client who is building their course in Rise. I really rather not provide the story file to the client (for them to publish on their review site) but can't see how to do this. I realize that I could use the embed multimedia feature but it isn't a very satisfactory solution. Is there another way? 

Thanks, Jen