Change the language in the CC desktop application and install it in another language, do it with the next. It will instal any language file into the very same InDesignintallation. InDesign chooses languages according to the OS language.
For a feature request you can submit it here: Adobe - Feature Request/Bug Report Form. You can try this. Create a new text frame, hold Ctrl (or Command in Mac) and Type>Fill with Placeholder Text. You'll be able to choose from different languages. With each option create a new paragraph style that you can call Japanese, Hebrew, Chinese, etc. and use it when need it. This would work at the paragraph level.
Wel, CS6 plus World Tools Pro was pretty complete. World Tool Pro didn't expose every single CJK tool in ID but it was awfully good.
I use the ME edition of CC and use styles based off the old Transpacific Digital templates to turn CJK features on and off.
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I've just tried this, I switched to Japanese in CC manager (through the Language option) and downloaded InDesign again. It seems to have replaced the old installation and removed all support for right-to-left languages that I had in the ME version. Also all my inDesign customised settings are gone. Even if I switch the CC manager back to English-Arabic and reboot, CC shows that inDesign is installed but opens the CJK version.