Thanks for testing, menotu. And yes, you will need a locale similar to Chinese, Japanese, Korean, Thai, etc. and the toggle should be CTRL+SPACE. The small, 1-inch icon should expand and where one can make a selection of the cryptic character, and this is where the real test would be.
It had become much difficult to set up SCIM and FCITX with later versions and the only success I had with it was back in version 2007.