Well, she doesn't have to be British, just be able to do a convincing accent. An inaccurate accent can be irritating and distracting.
Angelina Jolie managed a decent version for the Tomb Raider flicks as well as 'Sky Captain...', so I'm not adverse to any American suggestions, or other nationalities.
Incidentally, the silver wetsuit worn by Jolie in TR2 is very much the sort of thing Polly would wear. Of course, you'd need to get rid of the guns and knife, add a pair of long gloves, and she'd never dream
of going anywhere in flat heels, but it's a start.
I also forgot to mention: I really like how the crew has an alert chime for when they make maneuvers. That nicely makes it feel more primitive, and gives it some flavor.
Thanks. I wanted to give the idea that things are never entirely safe, that even something as simple as a course change had the potential to cause problems. And, as you say, that things are more primitive than we've seen before.