Playing is not really a priority neither is following canon but I would like to make a vampire army with different races so I was wondering if this totally contradicts the background.

Dwarf models for a block of tough infantry and dark elf horsemen for fast scouts, and chaos knights with chaos symbols removed for heavy cavalry, I would convert them to make them look more like vampires, I have made some snacks for the horsemen (screaming peasants with their hands tied behind their backs that can be slung across the backs of the horses) , and their will be peasant prisoners in the centre of the dwarf unit.

My reasoning is that a vampire would turn some of his fast victims into vampires to have food catching specialists, and since the chained food can only move slowly you would turn captured dwarfes into guards for the food because their lack of speed is not a drawback.