I've worked a bit more on my voxel raytracer to improve the current visuals to something a little more presentation-ready. The main thing was implementing spatiotemporal blue noise from this repository by nvidia. This makes the lighting look much more stable and gives a better sampling pattern. Looks decent even without screen-space denoising.
However, I think it's still best to apply a screen-space filter for safety.
It did introduce some weird errors in motion, though, and I'm not entirely sure how to fix that in a performant way. I'll have to keep looking into it.
Still, I like how it's coming along!