i think you could make this with tunisian. when it gets the the split, you could keep working half the stitches until both halves are long enough and then start stitching across the entire piece again at the other end.
This pattern is in Russian and I didn't try the actual link yet (cuz I don't speak/read Russian) but I love the sweater!
how to knit herringbone stitch
Эффектные узоры спицами со схемами