How do I export Chinese/Japanese/Korean language in single textField with the PDF build-in Fonts to reduce the size of generating file(with no any subset embedded)

Hi all

I know that if you want to display mixed languages in the single textField you should using the font extendsion solution: prepare your 3 language TTF font file and declare 3 fontFamilies that have the same fontName( or you can using the Arial Unicode MS for single TTF). but It alway embeds the subset of Arial Unicode MS subset in the PDF(this is not what I want because our PDF have size limitation). by the way, as I have no the TTF font files for 3 languages I haven't try the multiple TTF means. 

Or is there any ways that can directly using the PDF build-in font like the fontSelector to implement font auto Selection?

thanks in advantage