I use the the additionnal letters ḧ, ĥ, and ḋ. With the CMU font in emph mode.
So, with the following MWE:
\documentclass{article}
\usepackage{fontspec}
\setmainfont{CMU Serif}
\begin{document}
\emph{ḧ ĥ ḋ}
\end{document}
I get this rendering:
But the diacritics seems a little bit unbalanced, especially when it is followed by other characters with the same diacritic, as you can see bellow:
So, the goal is to horizontally move the diacritics to adjust it according to the following table:
Is it possible to do that?