Personally, I use one sided plane meshes as I’ve explained above but a thing that matters is the properties of those pixels, since you wont need a touch event or anything similar. So you can just disable those properties.
I currently just use this, I have tried many other things such as the material; I’ve found that Neon is the most optimized one but due to the glow (you cannot fully remove the glow even with setting the bloom to 0) it would look weird. I’ve only found that using the neon material be good for darker colors such as another project I’ve done: Procedural grass
I have also looked into a bit with other ways to render it: such as using a color sequence, but unfortunately they are limited to about 20 key points per sequence if I remember correctly, which would mean I would have to rework my compression methods