If the question is not so much about how to access and use these characters, but, as you said, how to make them, then instead of InCopy, I'd recommend using Illustrator or Photoshop with an extension like Fontself.
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If the question is not so much about how to access and use these characters, but, as you said, how to make them, then instead of InCopy, I'd recommend using Illustrator or Photoshop with an extension like Fontself.