The thing you can do with really any sonority created by a harmony or, in this case the octatonic scale, is create a tonality for it. Just like in tonal music you have "scale degrees" where you know some notes will relate to other notes, you can do the same thing with the Octatonic Scale without relying on "functionality." If you find a particular harmony evocative of the Octatonic's first pitch, use that harmony as a referential point.
Then, from a contrapuntal perspective, you can build scales off of different scale degrees to evoke different harmonic areas that then relate to the referential point and move around it. You can create expectations and delay them for greater effect, for example. The interesting thing about the Octatonic scale is that it's symmetric, something that's not common among all scales. If you wanted to, say, avoid diatonicism (which is perfectly understandable with this work), there are other symmetric scales that would blend well here.
In fact, your entire work could be based not on simply the Octatonic Scale but also the Whole Tone scale and fully Diminished Arpeggios that would complement the symmetry of the pitch relationships. Then you have more ways to create variety within the harmonic structure of your sonority and give you more options to work with in composing this work or the next. Additionally, you can create your own synthetic scale with the idea of symmetry in mind and use that to further develop the sonority.
You might as well just write another piece with these things in mind, because other than the end, I think what you have is interesting enough for me.
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For fun I just orchestrated a Whole Tone scale in a harmonic stack moving to an Octatonic scale orchestrated in a harmonic stack. The progression is better than sex! :)