I can understand where you’re coming from. You don’t want to mess up the flow.
My original idea, was to compose to a piece of a movie/film, so I think Movie/Film Score rather than soundtrack would be a better term. If you are making a piece of music to an assumed film without the visual part for people to see where the ideas come from, it’s more like an instrumental piece of music. Although a film score is generally instrumental in nature, it’s structure is born from the visual queues in the piece of film itself and needs to evolve in the directions of the film clip.
This makes it pretty time consuming, and much thought has to go into it before you even play a single note. It’s a very niche genre, that I don’t think many people are interested in here. It also needs a little bit more setting up, as in what genres people are interested in doing, then which movie from those genres. The clips need to be made and so on. Is it time consuming? Yes. Do you learn new stuff? Yes. Is it rewarding? I think so, but that’s me.