It’s in Unicode 01FD. Should not be hard to ask him to implement lol.

Wow this is pretty complete except for that pesky problem (which would not be that hard to fix). I’d also add the narrow no break space as it’s useful for French and liturgical typesetting which often uses French guillemets.

Do it!

Also if you use LaTeX this is a more than adequate solution for the accented æ problem. You may have to adjust the formatting here but it works.