How would you model a low exposure motion?

Its quite simple to do something like the airplane with Geometry nodes. Using Instancing along a curve.
I assume the same could be done with each ‘frame’ of an animation. Hopefully one of the GeoNode experts can explain how.
If you scale the curve down to a single point, then use the idea @canerasln had of using a conversion to a volume and back to mesh again - you should be getting what you desire.