I agree with the condensing idea - that usually helps me make better orchestration decisions in the long run and see where I can add/remove/alter portions of the work to improve it.
There's definitely room for a symphonic setting, but it will take work to decide where and how to split the sections, where and how to expand each idea and section, etc. Definitely don't feel pressured to fit in the mold of a long symphony. Think over it, sketch out some options for ways each idea could work in longer and shorter forms, then let that guide your decision. You want (1) each movement to be strong on its own, and (2) the movements to contribute towards the larger whole of the symphony.
Good writing! Would love to hear you continue with this one.
Gustav Johnson