Some of the principles of various historical styles of armed combat can be applied admittedly, aside from what's abstracted away or affected by quirks in game mechanics.
One thing that makes an armed style hard to untangle from Kisat Dur however, is that even when unarmed you have little reason not to enter combat in armor, and even armed combat will make use of grappling whenever it's practical. You can see a parallel with various schools of medieval swordsmanship, which often cover how techniques differ between duels unarmored vs. in armor. Armored combat often led to grappling and other techniques beyond the use of a weapon, not only because a sword is generally not the best weapon to use against armor, but also as it's simply practical to use everything at your disposal
So ultimately, a comprehensive and practical dwarven equivalent to Harnischfechten would still make use of any principles in conventional Kisat Dur that remain practical while armed and armored. To expand on it and add equivalents to Blossfechten, we'll likely need to wait until martial art support exists in DF, though modding would allow some expansion to this already.
For example, the pommel strike in vanilla DF is rather underwhelming but no slower than normal attacks, so while it might not do much it might still be slightly better for striking an enemy in the helm than trying to cut or stab. But with some rebalancing you could rework it into something closer to a mordhau, making it riskier to use but much more effective for stunning the target or breaking their neck.