Looking for automated solution to deal with out-of-font characters

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I have a massive amount of UTF-8 text to layout with many Japanese terms inline. The font to use is a modern typestyle with limited characterset (ASCII+). If you import this text in InDesign, all the Japanese shows as pink boxes.

Now I need any of the following 2 solutions:

1) A way to select all "Pink boxes" and turn them into Characterstyle X. That way I can set Characterstyle X to font "Osaka" the giant OSX font that includes all characters.
2) A way to feed InDesign makeup-markers in plain text that get converted to the appropriate styles in InDesign? All text is inside a MySQL database, and it is easy to let PHP catch the Japanese characters and wrap them in markings. Say [style="osaka"]にほんご、にっぽんご[/style].

Why can't you just specify a backup-font in InDesign? That would make things a lot easier. All browsers work like that already.