Found an intriguing #JapaneseKeyboard project, a DIY #ChordingKeyboard for hiragana and katakana: #KanaChord https://github.com/maccody/KanaChord

Right hand gets vowels あいうえお (and ん), which can be pressed together with the left hand to select the other #Gojūon dimension (かさたなはまやらわ). Thus い(i) plus か(ka) gives き(ki). Ingenious - and it lights up for bad combinations!

The author later extended it with a touchscreen for kanji selection, clever but a bit slow? https://hackaday.com/2024/10/05/introducing-the-kanachord-plus-keyboard-カナコード・プラス・キーボード/?preview_id=725437 https://github.com/maccody/KanaChordPlus