Yea, that would be the worst spinoff ever. Final Fantasy VI: Reconstruction. Join Locke, Terra, and the gang as they fix old homes and rebuild towns destroyed by the forever dead Kefka. Fight your way against collapsed roofs, scavenger rats, and Gau's illiteracy.
There just isn't room for a sequel. Don't destroy what people love like the rest of what Square-Eunuch does.