Just to inspire true developers: I'm playing with the code of a new tool, that replaces/adds diacritical marks of the character preceding the cursor into edit textarea. The trick is to decompose the character with .normalize("NFD"), to change what needs to be changed, and to recompose it with .normalize("NFC").
Much faster and comfortable than the usual, painful search for the needed exotic character into Special characters or into a Unicode table.
The code is primitive and undocumented, styling is horrible, but it runs and it seems to be a stand-alone code running into any project ( NOT into Visual Editor, I presume) , to test it simply mw.loader.load() it in edit mode from
and feel free to use/change/ignore it as you like: it's simply a "running idea".
Alex