Sure: your point feels right logically and politically, but in fact it doesn't quite work that way: for Latin script-based languages like Portuguese, non-ASCII

Sure: your point feels right logically and politically, but in fact it doesn't quite work that way: for Latin script-based languages like Portuguese, non-ASCII letters are extensions (diacritics or liaisons) of the basic Latin alphabet that are often left out in informal writing (eg by grade students, when texting/chatting, or by "uneducated" speakers) when the context is clear and a romanized phonetic approximation is available. As a result, native speakers are well used to homonymy in daily use, even though it might appear quite confusing to a non-native. So, in practice, ambiguities like the one you point out are more likely than not to be as constraining to Latin script-based programmers as common English homographs like "bank" do.