I would prefer a Great Estoc to be shorter, with the 2hand thrust animation, but sideswings disabled. So its an awlpike type weapon for 2handers. Two-handed swords with polearm animations are lame when you can just use a polearm instead. It would basically be a support 2hander for line fighting, like all the new polearms added with the last patch. No sideswings would justify a 2hand thrust animation and above 30 pierce damage.
Kanzer is the Russian word for this kind of weapon, and I figured it could be more like a Goedendag/Two-Handed Sword/War Spear hybrid in stats but with much better pierce and much weaker swing than the Goedendag or Two-Handed Sword. Basically being between Great Sword and Sword of War in the weapon list. It should have better stats than War Spear but cost twice as much and not be usable with a shield.
My suggestions for Estoc are basically the same as yours, I imagine it as being the Longsword type weapon, but would prefer it to have stats more like an Espada than a Spear, for fast 1vs1 combat.
So the Great Estoc would be slow, long, high damage, two-directional stabbing weapon with two-hand animations. Estoc would be a duelist weapon comparable to to a Rapier, which could be used as a cutting-edged weapon for swings. Kanzer is just somewhere in between, a non shit version of Goedendag with more War Spear esque stats.
High thrust and half-swording certainly should go hand-in hand, but they all use polearm WPF thus are worthless and no one uses them at all. Would not want to see it mandatory on a high thrust 2hander as I'd rather just be a polearm character in that case.