How about an extension that allows the addition of diacritical/accent marks to all vowels in a selection – acute, grave, circumflex, umlaut, etc? In essence, it would be character replacement – e.g., a lowercase e (U+0065) would be replaced by, say, an é (U+00E9).
Consonant markings could also be considered - e.g., n–>ñ, c–>ç, etc.
Thanks!