I made good money shooting 6x9 cm color of commercial fireworks displays.
Sorry but that was all analog. I have no images to show you.
I was a carded commercial pyrotechnician (wiring specialist) so I got a front row seat.
I did come to believe as you do that there's a concept, "writing with light," which gets lost
in human vision. BANG! And it took a while to process the residual image in my eyes.
After a while, I think I came to imagine what the "writing" would look like as the pyro exploded.
Your images are such grand experiments.
Thanks for sharing the brilliance of the different light sources.