You do know Irregular make an extensive range of colonial native figures and they can match with Blue Moon, right? And there must be others. I'm sure you could make it work if you wanted to. But I would say that, wouldn't I? Of course, I am making it work, too, so I say again you can do it. I'm just not targeting that set of rules.
So, go for it in 15/18 mm if you want to.