Stick
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I'm not saying there should be only dwarves. The composition can be diversified with various creatures, like yetis, rhinos, and others. I'm just talking about the dominant race.
Added 8 minutes later
Besides, they wouldn't fit into the Stronghold as an alternative, because orcs, ogres, and so on live in the Stronghold, but not humans.
They would fit in just fine. The Stronghold is not only an alliance of orcs, ogres, and goblins, but also of humans. Look at their heroes; there are many humans among them.
Added 8 minutes later
Besides, they wouldn't fit into the Stronghold as an alternative, because orcs, ogres, and so on live in the Stronghold, but not humans.
They would fit in just fine. The Stronghold is not only an alliance of orcs, ogres, and goblins, but also of humans. Look at their heroes; there are many humans among them.