the problem you described is not fully clear for me. May be it could help me to understand it better when you provide an example project demonstrating the issue? What do you mean with reloading charsets?
Please note, that within one font resource there is always 1:1 relation between a Unicode code point and the associated glyph. Consequently, when Chinese and Japanese use the same Unicode points for different glyphs, they can't coexist within one and the same font resource. You will need:
Option 1: manage two different font resources. One with Chinese and the other with Japanese glyphs. Select the right resource depending on the text content you plan to display.
Option 2: map the overlapping characters (e.g. from Japanese) to other (unused) Unicode code points. Doing this ensure that strings containing Japanese text are correctly converted in advance to use the mapped Unicode code points. How you map the code points is explained in the section Ranges.
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