Parallel to all this, Hayastan starts as a tribute-paying satrapy of the seleukids, like Baktria, and has an independance event much like Baktria. In fact it is so much like Baktria's that I can just copy paste it :
Arche Seleukia will demand a tribute of 3000 every winter. Refusing it will lead to war between Hayastan and Arche Seleukia. Winning at least 6 land battles and capturing at least 3 regions from Seleukia will make Hayastan a kingdom, ending the war.
Note that an event will fire after 6 battles won and 2 settlements taken, where Hayastan can be forgiven and become a satrapy again, allied with Arche Seleukia (and paying tributes again, I would assume).