I'm not sure about 'summat' to be honest. It's a bit northern. On the other hand, I can see Spike using it in a jokey way, so I think it's all right.

And you definitely get 10 bonus points for mentioning the Weimar Republic, which I'm sure Spike and Dru would have loved. You'd get a virtual skyful of gold stars for writing a fic set there, though.