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.
Giromanica Crochet e maniche di set-MV Maximova
Узор для шарфа спицами | ДОМОСЕДКА
Knit armhole and neck. Calculation of curves
Knitting - Wonderful cardigan with & quot;