Multiple clans is a possibility. I only think of it because of the Dunemaul Clan and also it being a more fun way to deal with the Gordunni Clan if the Horde takes over Dire Maul. Not to mention the AU Stonemaul Clan members that were quickly forgotten.
Otherwise, the simplest way to deal with playable Horde Ogres is to have the MU Stonemaul Clan with the AU Stonemaul Clan mixed into it.
The MU Stonemaul Clan is the most important of the Horde Ogre clans, since they’ve had big history with the Horde since Warcraft 3 and were one of the original members of the Horde. They need to be part of the playable Ogre faction, if not THE main focus of it. I would guess the racial hub would be in Dustwallow Swamp, which could be the actual Stonemaul Clan home, which could be taken back for good in a questline or an unlock scenario if they’re treated like an allied race.
The AU Stonemaul Clan, as mentioned before, brings things like Draenor designs for things like heritage armor, Draenor beasts like boars for potential mounts and hunter pets, building designs, and also gives Ogres multiple personalities. That would be the typical big and dumb type to the cunning and savage type. It also ties up that little loose thread from the Mag’har Orc unlock scenario. All that is needed is a brief mention of them joining the MU Stonemaul Clan to explain the stuff from Draenor appearing.
It’s hard to know what direction Blizzard would take playable Ogres and the Horde Ogre clans. There are many directions they could go with them. Hopefully, the MU Stonemaul Clan will be part of the playable Horde faction should we get playable Horde Ogres.
Dream big, Ogre fans!