The Exodus Down set from the Menagerie should be able to slot the Opulence seasonal mods. You can get the mods in the Menagerie and the set shares the seasonal emblem. Not to mention it is only available through the Menagerie while the set from Nessus, now that 2.0 is a thing, is the exact same set in every way - all except the seasonal emblem. All's I'm sayin' is that it should get the chance to equip the Opulence mods.