They could take the Orbs, Warriors of Light and take all FFs 1-6 and create a action-RPG in an HoR co-operative way or alone (all those choices) and well think of it, 5 classes of choice, it could even basically be at the same scale. Action homage.
Some like 6 could have interesting methods, I'd say the same of Dragon Quest but Gremoir or what ever would get his panties in a knot. Who died and gave him the Blazblu.