So in the past I’ve had many a nightmare receiving garbled unicode characters in an email or in a poorly encoded database field, so I’ve written a basic tool that works with some of the most common Western European characters and will correctly convert them (optionally to their closest matching standard ASCII character).
I am going to try and work on a full set (that can be incrementally loaded), but this has been sufficient for my needs so far.
Edit: I’ve updated the Tool to allow for various functions, input via literals (\x0d or \u02f4), returning to multibyte in the text area and other fixes. The same link will work.
This link was incredibly helpful with my investigation and testing!