Hi Riyadth,
Yes the original 4 were air knight, earth priest, fire rogue and water mage so it would be fun to make an adventure with the other three lol. Though the elite people were planned to be different people from these three.
And in order to have the option to side with Brookhaven without romancing Deita is to have very low villain points. If you side against the crown decisions, have sympathy for prisoners and forest bandits, talk with Deita in the tower daily, and don't return romantic advances, you should be able to convince Lor to include you in Deita's plans to side with Brookhaven.