This has to do with your character map for tinyMCE it’s located inside:
wp-includes/js/tinymce/themes/advanced/js/charmap.js
Although I wouldn’t recommend editing the WP-Core you could theoretically just add new characters there like so:
['Ī', 'Ī', true,'I kahako'],
['Ō', 'Ō', true,'O kahako'],
and so on…
However when you update WordPress this will overwrite those changes. So it’s not the best solution but it would work.
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