Before I ever knew you could change the language on your computer (e.e; Ehehe), I was using a Japanese word processor, and all I'd have to do was type up what I wanted and in most places I could just copy and paste the Japanese text. It's worked most places I've tried it, so might I suggest that to soem of you? I'm not sure if it would work with a MAC computer, but it's worth a try ne?
The one I use is called NJStar Japanese WP.
testing: すごい です ね？
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