Japanese characters in URLs

I’m moving this over from the community forum, in case anyone here has something to add.

We want to use Japanese characters in the URLs of a site, but can’t find any examples of EE sites that have already done it.

I’ve added the character sets to $config[‘permitted_uri_chars’] but am still getting the unable_to_create_url_title error message when trying to update the url.

I’m also unsure of the practicality of using the mixture of Japanese and Latin characters in a URL - does anyone have experience of solving a similar problem (perhaps with another language with a non-Latin character set)?