Hi there.
I have used SEUS in the past, couldn't find it on Curseforge though, but by chance I stumbled upon a shader called UShader, which is supposed to look a lot like SEUS, doesn't utilize its code, though.
I read that SEUS itself was tested on this mod and is compatible, so I wonder whether that's the case for UShader as well (as in is it compatible).

I have no clue about shaders themselves as I just create modpacks. I would love to have one like that in mine, though.

I will probably just right away go and see if it crashes, lol but if it does work well, maybe you can add it to the list of working shaders, or the sort.
https://www.curseforge.com/minecraft/customization/ushader

Seems there are issues. Posting my latest.log (ignore the crash at the end, my game was dorking around)
latest.log

With version 0.2.0, there are no compile errors now, but there are still some problems with rendering. 😢
I will try to fix it.