Epic spells are generally believed to be generally weaker—or at least more cumbersome and difficult to make more powerful—than true 10th-level and higher spells, which were available to some of the darklords prior to Die, Vecna, Die!. So if true 10th-level and higher spells couldn’t do it, epic spells can’t do it either.
Whether or not the rules in the Epic Level Handbook reflect this is kind of inconsequential, because we expect the Demiplane of Dread to be exceptional in this regard, and don’t expect Epic Level Handbook to cover that exception.