A little bit of thread necromancy to say that you can in fact upgrade the Ironworks gear to Augmented versions for 100 Poetics even after this patch. I upgraded old pieces today (Jan 2021) However, the vendor is in North Shroud, named Drake. He is near Gerolt in Hrystmill. The vendor works the same as all the others, he's just not in Mor Dhona like you might expect.