Disable trackpad handwriting keyboard shortcut without disabling Chinese keyboard input?

In the Keyboard Shortcuts preference pane, this is the one shortcut that can't be disabled. It's disabled if you turn off Chinese keyboard input, but I want to keep the keyboard input.

I got hopeful when I found this technique for editing the symbolic hotkeys plist:

https://stackoverflow.com/questions/15719135/how-to-disable-keyboard-shortcuts-in-mac-os-x

But I haven't been able to find a symbol corresponding to this shortcut.

Solution 1:

I couldn't find a way to disable it either, but if you click on the shortcut key combination, you can change it to something you'll never press. (I used shift-control-option-command-space)

Solution 2:

Removing all the Chinese input methods and adding them back (except "handwriting", obviously) should make the shortcut go away.