This may be too techno-wonky to even ask, but is there any way to encode a string in an InDesign document that will be passed as-is to EPUB, so that things like HTML or Unicode characters can be designated?
I have a dual-format book that uses the circled-one glyph, ①. In the print doc, I can use Wingdings, but that font doesn't pass reliably to EPUB or Kindle. If I swap in that HTML character code (①), it gets converted to '&#9312;' in the export text. I can edit that, but it's one more step I'd rather avoid.
So is there any way to get that string—and others like it—directly to the exported file?
— | Word & InDesign to Kindle & EPUB: a Pro Guide (Amazon)
if you could manage to pass an OpenType font to that EPUB you could do your own font for the numbers in circles with e.g. IndyFont from Jongware and Marc Autret. The glyphs showing the numbers in circles could be at the usual Unicode code points for the numbers 1-9.