This is brilliant, thank you very much @Stereo.
At Patrikpat's 2018 F1 Suzuka update there's no conflicts with Ilja's shaders as far as I could tell and no hit on framerates.
It's just one of those tiny little details that adds a lot to immersion.
Assetto Corsa keeps going from strength to strength thanks to the ingenuity and dedication of modders. Thank you thank you thank you, one and all!