Also, what do you mean by "inadequate English alphabet"? Inadequate for what?
Presumably for representing the wide range of sounds encountered in non-English languages. Although I don't know if there's any single Earth writing system that's any more inclusive in that regard, aside from formal phonetic alphabets.
Has any Star Trek novelist ever come up with an explanation for why the woefully inadequate English alphabet and unstandardized English language became the standards for the United Federation of Planets?
I'm no novelist, but I can certainly see how it would be. There were four choices, based on the founders of the Federation. We know that Andorian has unpronounceable words and that non-Vulcans regularly mangle the Vulcan language. We don't know anything about the Tellarite language, but the last choice is English, the language of United Earth, so...that's what you get.
I once (back in 1987) wrote an essay for myself called "Why Earth English is the
Lingua Franca of the Federation," presented as a class paper written in-universe for "Federation History 101." I came to similar conclusions to yours: Vulcan is too complex, formal, and hard to pronounce; Andorian is also complex and flowery due to its musical elements and contains difficult sibilants; and as for Tellarites:
They are such an argumentative race that they have not even agreed on a common tongue for their own home planet. Many Tellarites flatly refuse to learn otehr Tellarite languages. ...Occasionally, speakers of one Tellarite tongue will make a gratuitous chnge in grammar, phonetics, or vocabulary just to annoy others. ...The only advantage, to some people, of Tellarite languages is the high number of insults and profanities they contain.
I'm actually surprised by how well the paper's ideas hold up today, up to a point. I don't feel like transcribing the whole handwritten document, though.
Now, why is English the language of United Earth? It's already quite dominant globally in 2014, so I can certainly see that lasting quite a while. It's only been dominant in the past 100 years, but I don't see any other languages taking over anytime soon.
At least currently, English is the universal language of science, engineering, and spaceflight, which gives it an edge as a common tongue for a spacefaring society. Add to that the fact that the inventors of warp drive and the first intermediaries with the Vulcans were from the United States, and that would do a lot to reinforce the dominance of American English.
I have never encountered anything started with Cae- that was pronounced KAY in any way. Weird, weird, languages exist over your way though so I'll give you a pass.
I thought there must be something, but I checked my dictionary and there wasn't. I'd thought that "Caerphilly" (as in the cheese) was pronounced approximately like "carefully," but apparently it's more like "car-filly" (which spoils the pun possibilities).
Apparently the Roman pronunciation of
cae (or at least the way we choose to interpret the pronunciation of Latin in modern times) was roughly like "kai" (rhymes with "pie"), and "kay" is pretty much an American-English approximation of that.