[XeTeX] Mixing English (Latin) and Chinese (CJK) with fontspec

[Pander]

Hi all,

I have a document with both English and Chinese in which each language
automatically gets the proper font by means of XeTeXinterchartoks and
newfontfamily, see attachment with minimal example.

However, the current setup can only use one font for English and, look
at the FIXME entries, I need another font for the chapter heading.

Also the fontspec LetterSpace is not applied, see last FIXME entry.

Could someone please help me to upgrade this example to use working
fontspec commands and fix the aforementioned issues?

Regards,

Pander
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