I've just posted an update to the Bryan font so that it now supports Western, Central and South European glyphs. These cover diacritics & characters such as sharp S (ß). This brings the glyph total to 392!
While I'm wary of adding characters that I don't have handwritten examples for, diacritics are accented versions of existing characters, and I felt I had enough source material to imagine how my dad would've written these. Now that I've done these, I'm going to spend more time looking through his notes to find any unusual characters or style choices to add to the font.