When pressing the Inventory key (default E), open GUIs are closed. It would be nice to be able to do this with the Baubles GUI as well, so changing the Baubles key to E doesn't require us to use Esc for closing other GUIs quickly.

Wait a second, apparently it does work if you set them both to the same key.
Forget that then. Yay for Minecraft! __cough cough**

This was the case once but was closing the creative inventory when you typed that key in the search bar.

How about calling keyTyped on the currently active GUI with the open inventory keycode, or temporarily set its keycode to the open baubles inventory one?

Nevermind I don't think that would work either. Too bad Minecraft's limited in that way. Only way I could see it working if you set both keybindings to the same key and work with that.