As I understand, the only way to unlock the Blood Mage specialization is to personally enter the Fade during Arl of Redliffe, something that can only be done if you are a mage Warden. However, I've seen a few old guides that list either Wynne or Morrigan as Blood Mages despite not playing as a mage.
So my question is as the title says. Is it possible for Wynne or Morrigan to become Blood Mages if I myself am not a mage?