DBWI: Roman Empire restored?

So I'm sure we're all familiar with the Collapse of the Third Century, where the Roman Empire fell apart after a decline beginning with Commodus. Despite the best efforts of Galleinus, the West broke away into the Gallic Empire, and the Eastern Empire accepted Odenathus and Zenobia as leaders of the new Palmyrene Empire. Rome was far, far too busy dealing with Barbarian invasions of Italia to reclaim the lost provinces. Eventually, Rome would accept its collapse and while the Roman Empire would continue, it would never again reach such massive heights. My question is this: could Rome have recovered Gallia from Postumus and Palmyra from Zenobia? I know it seems ASB, but Rome had theoretically been through worse? What would the effects of a Roman Imperial Restoration be on history, and how could it have happened?
 
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