*All* unicode characters are representable in utf-8. If a character does not appear for some reason the issue is that the font being used does not support the glyphs for that character.
Very few fonts support all the characters in unicode as many are rarely if ever used since they are for dead languages, etc.
So you can use Sigil to embed a font thatdoes support the specific characters you desire. The utf-8 vs utf-16 vs utf-32 has nothing really to do with that.
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