I'd like to think that allowing a 8-bit character set would be a considerable improvement.
Knowing of the problems that a normal keyboard layout causes, especially with notebooks and smartphones, a workaround for some of the most relevant characters could probably be offered as an addition to the format-and-emoji-button section, wherever applicable (such as for comments, (advanced) search, forum and, of course, upload). This addition could be a list, such as this below, so characters in question can be copied and pasted. Surely members can help to identify the most relevant list. It's a bit clunky, admitted, but I didn't design the keyboards.
æ Æ ø Ø å Å ä Ä ö Ö ü Ü ß ç Ç
Uwe