Top accent position of OTF math font in XeTeX and LuaTeX

MWE:

% Xe-/LuaLaTeX
documentclass{article}
usepackage{unicode-math}
setmathfont[math-style=literal]{Latin Modern Math}

begin{document}

$dot b, dot  ?, dot{rm b}$

end{document}

The accent placement seems to be wrong, in my opinion. The dot{rm b} example seems to be right. How to get this as the default behaviour?

OK, in LuaTeX we can change the top_accent values of the OTF table, as Marcel Krüger has done:
Fixing the position of math accents when using unicode-math in lualatex with a text font for letters and digits

But is there a simpler solution? In this answer a faked math font is used, but I would like to patch a real math font. So some lines of code can be omitted, can’t they?

What about XeTeX? Is there a solution, too? Are the top_accent values represented by a fontdimen?

documentclass{article}
usepackage{unicode-math}
setmathfont[math-style=literal]{Latin Modern Math}

begin{document}

$dot b, dot  ?, dot{symrm{b}}$

$dot{b{}}, dot {?{}}, dot{symrm{b}{}}$

end{document}