I really love how you've taken canon-Qrow's role and AU'd it into being a spy and also still kind of being like "sighs about the world." The easy route would be me saying "Luke owns a bar that Qrow may or may not be familiar with in the city" but also while his AU only has him really skilled in fencing the fighting thing would be of interest to him.

I'm not entirely sure yet how but I'd be up for some vague pre-established CR with them if you are. Luke's only 23 but he's most likely to keep an eye on adults that are keeping an eye on things in the city anyway since he grew up here.