That's true local boards are hard to moderate but in the case of Urdu language it can easily be translated from Google and this translation is almost perfect, it's very advanced now. Google is really doing a great job in translating languages now. So I guess from the management perspective it should not be any different from managing any other language board like Arabic or Hindi for example.
Some local boards are functioning pretty good for years without having their own moderator who is a native speaker so that's not a problem at all. For example, Croatian local board had Lauda as mod but then for some reason he was either removed/he asked to be removed due some drama (I don't know the details as it was before my time) and we never got the new one. We asked for a new one but our request was never approved, probably because our local is very clean and we don't have much spam, therefore not much work for mods.
With that being said, of course it would be much better if each local has its own mod as I think mods could be more than just a forum police, but its possible to have decently organized and clean board even without it.