I think Finnish mythology has at least one 'water-dwarf', and there may be a whole race of them. That may be something to think about. Either an aquatic race, like Mer-dwarves, or maybe a steampunky, submarine-weilding force of Dwarf Pirates?
Japanses mythology has a kind of gobliny thing called a bakemono, I believe; orange skinned and unpleasant, they might (they're short and violent) be dwarves rather than goblins. I think they lived underground, like Norse dwarves.
Joan Aitkin wrote a book where dwarves living in a cave in Wales were not, as first thought, "Fair Nixies" but "Phoeniceis". So, Middle Eastern dwarves, who had pit camels instead of pit ponies. Or, perhaps a dwarf army of 'the Fair Folk' of English myth (blue and green, Fairy Queens and all that).
How about nomadic dwarves? Either steppe-nomads, or a Mormon/Oregon Trail kinda settup, with wagons and cavalry? Could be fighting the dino-riding humans perhaps...
Perhaps some of these will suggest something. Perhaps not. I offer them anyway.