A very interesting topic. It’s in fact a widely spread practice and seems to be allowed by Envato. As you mention, there’s quite a variety of sound-alikes around the jungle. Just type “Stranger Things” or “Game of Thrones” and you’ll see authors from all levels (from newcomers to elites) uploading several items of this kind. They actually sell pretty nicely; maybe I should give it a try in the future.
There’s another thread where that has been discused:
Cheers!