This mod lets you play as any race. The mod uses the game's race list array to just let you play as any race in story mode. This applies to playable character and starting slave. The file can be downloaded here: AnyRace Extract to the game's mod folder as per modded guidelines. Mod made for and compatible with 5.24c
Unfortunately I discovered a problem on my windows 10 device, where only one mod can be active at a time, but my windows 7 PC is just fine. Not sure what's exactly going on, if I did something wrong or I missed an update or what.