@cstross Joke's on you: A ton of Americans (I am tempted to say a majority but I don't have numbers) are delighted, charmed, or downright obsessed with anything and everything from Great Britain, the UK, the Commonwealth, etc. UK and related fiction is huge, on TV and in print. The royalty regularly become fixations for millions of people, and the dialogue? Come on. Americans love that shit. Can't get enough. It's almost a cheat code thing to put someone with a British (or Irish or Scottish or Welsh) accent/dialect into a US movie or TV show. If it's a posh accent, many Americans are charmed. In fact, posh British accents are more or less shorthand for "sophisticated" or even "intelligent." If it's Irish, Scottish, or Welsh, then the reaction is "Aw, the adorable people of the Old Country with their twee curmudgeonly ways." If it's English but not posh (e.g., Cockney or a hundred other variants), then the reaction is "ooh, authentic! Very cool!"
So keep up the good work. Keep that dialogue pumping into our veins.