Really Big Sigh.
I did a couple rounds and found myself with half a round right and half a round with exacty the same error as before. I just couldn't look at that pattern again, so I pulled everything I had knit of it out and picked a new pattern.
Number 56. Vierfacher Zopf. Quadruple Braid. It may have it own intricacies, but at least I can read the thing when it is already knit.