Hi Karen,
I don’t know whether distributing a special font with the application would be practical or not. If it is, this wouldn’t be hard to do at all. I work with Spanish punctuation and have modified a few fonts to get correct spacing. You can put in characters with a zero width. Simply add 10 glyphs for superscripts with a zero width. Type the superscript first and then the subscript. Some music writing programs do this. I use Fontforge, but there are others.
Don
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