Fortunately they are not in charge of English. Not even the English government is. At most they are in charge of their respective versions and advocacy of it.

Alphabets and certainly diacritics are used differently in different languages, so insisting on a certain way of writing can only lead to inconsistent pronunciation.

I think this illustrates the point well: if they were to write it in another script completely, English would adopt some transliteration of the name, i.e. an exonym.