Ain't gonna happen with a size 4 hook, even if you could get the size 4 long shanks it still wouldn't give you the distance between the eyelet and hook point.

Just as an example take an Eagle Claw 570 if you go to the Eagle Claw 574 it's only a 1/4" longer, so you're still shorter than you want. I've poured a long time and I've never heard of a 2x long shank hook.