This begs the question: what would be a sufficient sample size? I agree that he has to be a better option than Winker and should get the opportunity. Let's say, he gets called up today and plays the remainder of the games as a DH. If he doesn't rake, will the next step be, "he needs to get a full season under his belt?"
If we are calling for Hiura to get these chances, then we can't call out Turang or other young players who, at least, are an asset defensively.