This should be the log from a single threaded run. For better or worse, no change with only single threaded, it's still exiting early with no other logs being generated. I don't really have a good understanding of where to go next from here.
Whoops, I had run with only having RenderThreads=1, not actually RenderTexturesSingleThread=1. With that additional flag, it looks like it's going to succeed (still running but it's already gotten past the prior error point). I'll upload the logs from this run once they finish and I wake up.
Also that is a really cool feature, thanks for the tip! I see that the textures\architecture\solitude\sstonebase01.dds winner is from loose files. It has, in order: Data, Enhanced Solitude SSE.bsa, Skyrim - Textures1.bsa.