Answering the OP, I get the feeling that Dorian wants to get back to Archon Hessarian's path.
Over a hundred years before Drakon, Hessarian was the first ruler to embrace Andrastianism. During the Transfiguration the non-mage lower citizens supported Hessarian and a lot of members of the ruling Altus class were killed, as well as several Laetans who refused to convert. The non-mages started acquiring positions in the Magisterium, especially through the new Imperial Chantry. Temples to the Old Gods were repurposed as Circles. The "magic exists to serve man" was interpreted as the mages having the duty to devote their talents to public service in the Imperium.
However, after Hessarian died, the Imperium has been taking down the reforms he supported instead of advancing them. I think we heard the tale of an Archon who tried to ban slavery being assassinated. Lambert's friend who became the Black Divine was a supposedly a reformist, but he conveniently forgot that once he got to power.
So, if Dorian wants to restore "Tevinter's honor", I'm pretty sure it will be about Hessarian, the best Archon Tevinter has had, even if he did it for pargmatism instead of morality.