Draan is held within the marks branded onto a herald, I don’t see how channeling it into your arm and then bleeding before extracting the draan, gives you the substance. The process just doesn’t make much sense especially with how Draan works with something like binding.
From what I’ve seen in the past from ST is that nearly any MA is capable of creating liquid mana but I’d check depending on the canon source with a case like necromancy or naztherak. That being said, Azdrazi are not anti-magical in the sense you’re saying with them not utilizing a form of mana. Dragonsflame does have properties that let it interact tangibly with magical beings and spells but it is not Thanhium or auric oil. Azdrazi, and by proxy I assume heraldry, use anima as a source of energy.
This means that Azdrazi have mana in that from: “The main ‘purpose’ of anima in mortals and deities is to facilitate mana production. There is a direct correlation between how much anima a soul has and its magical potency.”
And emote count with irl duration is in pretty much any potion with a lasting effect, but I’m not sure exactly how those limits are calculated between emotes and minutes or if that’s added later by ST or not. I simply asked because I’m used to seeing it everywhere.