Comet oki actually works on Hakumen if Makoto knows what she's doing. The good ones I fought figured a way to do it and make it work even with the counter. You do the comet orb then jump up, and come down with j.2C or j.B or something. If Hakumen counters it, it whiffs while you're above and you come down with mixup. Of course they could counter your jump in, but it's hard to tell if you're going to do a jump in or go for a throw or whatever.
That's as far as I got with it anyway. Maybe there's some super secret way to just blow the entire thing out of the water but I haven't seen it.