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I have one of these already fitted:
I've tightened the headset, raised the stem a little to relax the bend in the front cable (before I change the cable entirely).
Got some different brakepads I can try, but will try some epic toe in first.
Acliff-
Someone (like Ritchey) should market a headset with the cable guide integrated into the bottom cup, as shortening the length of the brake cable is the simplest way to eliminate judder. But with cantis slowly disappearing from cross, it might be too much of a niche product.
Radical toe-in isn't usually needed, just enough that the front of the brake block hits the rim first. A credit card at the back of the brake block is a good way of getting the right angle.
Edit: it's a bit easier to hold in place than a 5p piece.
andyp
Essentially, yes. The cable stop is the best option, you can get ones that fits to the headset and shorten the cable span, which helps a lot in my experience.