Software used:
Flowframes (with RIFE algorithm)
After Effects

I used Flowframes (which is free or "pay what you want" app with RIFE algorithm) to smooth every scene that has ED-209 stop-motion. I've done it twice: first 8x times, then 4x times.
After that, I took the 767.232 FPS smoothed footage, imported it into After Effects and applied "Force Motion Blur" with samples cranked to 40. It used the smoothed footage and turned it into motion blur, back at 23.976 FPS.
And I've done it 31 times separately with each scene, to avoid blurred cuts between scenes. Also I had to mask out the live-action parts I didn't want to be blurred.

Bugs:
1) muzzle flashes sometimes blur the whole scene;
2) the very last frame of each scene is not blurred, because the smoothed footage is shorter than the original footage, but that's not very noticeable in motion.

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