haha, didn't expect anyone to know U.F.O outside of a niche circle, even in Japan! Yuji Ohno and his music is very much tied to Lupin the III's identity, or I guess you could say Lupin the III's identity rests on Ohno's music. To my understanding, the best identifiable name I've been able to find for this genre or "sound" is exotica, or Tiki music. At least that's as close as I could find in the US vocabulary.
In the US, exotica seems to be more heavily influenced by Polynesian sounds and southeast asia, flavors imported through the coming home of post WWII military men. In Japan, the influx of foreign music right after the war, particularly American (jazz), French, and for some reason Latin (ballroom dancing: chacha, rumba, salsa, mambo) seems to have shaped the "exotica" era sound, at least in my observation. You can really hear those elements in Ohno's music.
Check out this radio, you might like it:
http://www.retrococktail.org/listen.html
I think it's always interesting, whatever the medium, when cultural (mis)appropriation takes an interesting turn. Sometimes it takes the insensibility (or open mindedness) of an outsider to take a fixed medium and reassess whether everything about it needs to stay fixed, or not. And since usually these cultural appropriations usually center around items of past eras, the reinterpretation happens under a new context, leading to eyeopening experiences when done with skill and care. (though most attempts end up just sounding foolish) Of course, people get all upset but well, in that case I think it was a bad choice of the object to appropriate. It seems to be more peaceful when the people owning the object are distant in space or time, or are no longer around. (precisely like when you want to steal something)
Awful !