Along the line of "random thoughts" I thought I'd throw in a couple of officially recognized languages that would be of very little use outside of certain circles.
tlhIngan Hol (ISO 639-3 code "tlh") with about a dozen fluent speakers worldwide is mainly useful only in matters relating to warfare and space travel. ...and of course, Sindarin (ISO 639-3 code "sjn"), which was common mainly in the Third Age.
buy' ngop!
tlhIngan Hol (ISO 639-3 code "tlh") with about a dozen fluent speakers worldwide is mainly useful only in matters relating to warfare and space travel. ...and of course, Sindarin (ISO 639-3 code "sjn"), which was common mainly in the Third Age.
buy' ngop!

LCHIEN
Loring in Katy, TX USA
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