You can create composite fonts using any a Roman font and any of the Simplified Chinese fonts. For example, the following PostScript code defines a composite font, Times-Italic+Kai-Medium. The Times-Italic is used for the ASCII characters and Kai-Medium font is used for the Simplified Chinese characters.
/makeEUCfont {
/AsianFont exch def
/WestFont exch def
/NewFont exch def
/CIDInit /ProcSet findresource
begin
NewFont [ AsianFont WestFont ]
beginrearrangedfont
1 usefont
1 beginbfrange
<00> <7e> <00>
endbfrange
endrearrangedfont
end
} bind def
/LC_Times-Roman /Times-Roman /Kai-Medium makeEUCfont