I would love to see a Gronder Field, I would imagine there would be you and two other armies and you would have to take a fort from each side at the same time, (Like with what you had to do with Ryoma and Xander in FEW1)
From Awakening the Validar map, Dragon Table, would be interesting too see, maybe having your units split up, two fight Validar, two just fight regularly.
Echoes I would chose either the Tower of Duma or the Rudolf map
Verdane would be a cool map, probably just take forts where the castles would be located