I've seen that photo Mitsu posted. I've searched for info on this particular plane markings before. I remain skeptical that it looked like that. The one photo showing that looks heavily edited, almost as if it was a painting rather than a photo. Possibly a touch-up or something over the original?
If it IS the original the quality of the photo varies from section to section, while the upper surface of the same plane's right wing is visible and appears to be a solid color with possibly a rising sun on it.
I believe the squiggly markings were rare and mostly post-war. I believe that for the most part the Ki-43s were marked as with any IJA Ki-43 -- they were green in varrying degrees of wear and tear, and the wing and tail markings were added on top of the craft as they received them.
The squiggly markings only show up on the same set of color artist profiles, and on some rare model kits. The one photo makes me suspect it's authenticity, and all other photos appear to have a solid color on the upper surfaces.
Such as:

and

That's why I suspect this paint scheme never existed on the Ki-43 during WW2, and why I never called "dibs" on it or anything.