I think the Unicode keyboards (??) don't get removed once language kits are installed. An old workaround I used with multilingual language access in 8.6 is to boot with the option-space (this combination is buried in the Help somewhere) keys held down.
This makes the language files and keyboards appear in the system file, and you can drag them out just like sound files. Interestingly you have to remove the language files first, then you can move the keyboards otherwise the keyboards appear again.
Once you remove the Unicode keyboards, you should have no keyboard menu. (I haven't tried it on 9 but I can't imagine this to be different)