keyhacだとこんな感じ

def configure(keymap):
…
# どのウインドウにフォーカスがあっても効くキーマップ
if 1:
keymap_global = keymap.defineWindowKeymap()
　　 #IME切替べたなやり方
keymap_global[ "O-LCtrl" ] = "Alt-BackQuote"
# LC- J/L/K/I : Left/Right/Down/Up
keymap_global[ "C-J" ] = "Left"
keymap_global[ "C-L" ] = "Right"
keymap_global[ "C-K" ] = "Down"
keymap_global[ "C-I" ] = "Up"