With some work, Pendragon/Paladin.
Warrior aristocracy
Epic heroes facing mythic monsters and/or each other
With their passions and feelings causing some behaviour patterns which might aid or hinder them
The ethos of the setting(s) run pretty close. How those are expressed (knights on horseback aren't the same as heroes in chariots) but the amount of work needed to convert - basically cultural backgrounds and religion aren't so huge.
Warrior aristocracy
Epic heroes facing mythic monsters and/or each other
With their passions and feelings causing some behaviour patterns which might aid or hinder them
The ethos of the setting(s) run pretty close. How those are expressed (knights on horseback aren't the same as heroes in chariots) but the amount of work needed to convert - basically cultural backgrounds and religion aren't so huge.