As for the combination Despard and regular outlet faceplate, and depending on how handy you are, a combo regular and decora faceplate would fit the mounting screws. And you'd need to trim the old depsard plate to the size of a decora device so it fits into the decora sized hole in the new faceplate. Use epoxy or such to glue the trimmed despard plate to the new decora plate. However this would cost more in terms of time (labor) than other solutions would...
Probably quicker to loosen the device mounting screws so you can space them closer to close up that gap between the existing plates.
