Arabs are like this too.
Control the 4 corners of the horse using SF/LY if you can-- even a few steps. The neck is just one facet-- don’t forget shoulders haunches. (My horse isn’t green so I use HP, LY, SI, HI in several variations to make sure I can always place each part of the horse where I want and he doesn’t blow through any of these aids-- Change direction every few strides to keep them from locking the neck/throwing the shoulder and plowing forward).
And tempo!
Can’t wiggle? I’ll shoot forward then! or be lazy! wait, I’m thowing my haunches out now LOL can’t catch me… Every stride a different evasion
I say it’s like fighting a battle on 5 fronts at the same time.
And be quiet in the seat and contact. Over-riding makes the wiggling wrose. Stable core= stable horse.