selenography
Hm? Where'd you get that impression?
It's certainly unofficial -- English has no official governing body, so essentially _all_ English is unofficial. However, zero-derived denominal verbs are quite common in even formal written English [0], are well studied [1], and aren't at all limited to American English [2].
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[0] As seen in this very thread.
[1] It took me almost no time to find a random academic paper [1a] and two Wikipedia articles [1b][1c].
[1a] https://dingo.sbs.arizona.edu/~hharley/PDFs/HarleyDenominalV...
[1b] https://en.wikipedia.org/wiki/Denominal_verb
[1c] https://en.wikipedia.org/wiki/Conversion_(word_formation)
[2] https://www.thetimes.com/uk/politics/article/the-pedant-noun...
> And thys vyce cometh of false hope that he thynketh he thall lyue longe, but that hope fayleth ful ofte.
[1] https://www.google.com/books/edition/The_Workes_of_Geffray_C... [2] https://books.google.com/ngrams/graph?content=false+hope&yea...
Or, come to that, "at least since Cicero's time":
> ...cui legi cum vestra dignitas vehementer adversetur, istius spes falsa et insignis impudentia maxime suffragatur.
[3] https://anastrophe.uchicago.edu/cgi-bin/perseus/citequery3.p...
Yes, there are portions of the internet which gleefully misuse it on everything, and sometimes I am part of those portions; but even there, a) it's marked speech, and b) you wouldn't say *Y'all'dn't've gone, you'd say ?Y'all'd've gonen't, and only partially because it's funnier.
Se fareblus oni, jam farintus oni. (It definitely won't happen on an echo-change day like today, either. ;))
Contra my comrade's comment, Esperanto orthography is firmly European, and so retains European-style casing distinctions; every sound thus still has two letters -- or at least two codepoints.
(There aren't any eszettesque bigraphs, but that's not saying much.)
(The uncapitalized version doesn't just have different semantics; it has a completely different parse-tree!)
It could still be adopted as a learnèd (read: pretentious) borrowing from Greek, of course, but in that case it would be spelled epicharicacy.