I'd advise looking into World Tools Pro.
If you are not already familar with multilingual typesetting in InDesign, you may want to take a look at Diane Burns' intro to the topic on lynda.com. I've not seen it yet but I have a hard time imagining that it is anything other than succinct and informative. She also covers other options (beyond World Tools Pro) to getting the Japanese composer to work in a non-Japanese localization of ID.
I visited this site some years ago and their templates were already very helpfull.
As I can see the site improve a lot and topics looks intersting. I will have a look.
Many thanks :-)