The (Japanese) karaoke I went to this week had two very weird Korean keyboards on their controller. The first was a 세벌식 layout in the most literal sense, where there was a separate section for each jamo type, and all possible jamo (including compounds) were listed.
But the second... It was like a Japanese 五十音 layout, but using 한글 and with some random extra keys sprinkled in. I regret that I didn't try it....
(Another) another day, another Japanese karaoke Korean keyboard variant. Just how many of these are there?
This is like the third variant I've seen at the same karaoke chain. Otherwise the UI has been mostly the same across different locations.