Lol I don’t think the accent would be a problem. I can do a London accent and I’m American. Plus if you haven’t already seen, Harry is the accent master. As for his acting, lol he didn’t do so well in Icarly which was a while ago. But he did fine in the Pepsi commercials recently. I’m sure with time he’ll get better (especially since the movie isn’t being made anytime soon). Just look at Justin Timberlake.
But as for fancasting, a lot of people fancast harry because that’s who they imagined. Not because of the acting aspect of it. And that’s great that you want Charlie Rowe, I think he’s awesome:) xx