Breite Gravis und Akut für pdflatex+newtx

\documentclass{article}
\pagestyle{empty}
\usepackage[ngerman]{babel}
\usepackage{graphicx}
\usepackage{newtxtext}% Load it after babel according to Michael Sharpe's newtx manual from Dec 14, 2017.
\usepackage[slantedGreek]{newtxmath}%% Should be loaded after the text font according to its manual. The default uppercase Greek letters should be slanted according to the SVMono manual.
\makeatletter
\newcommand\widegrave[1]{%
  \mathpalette\@wideaccent{{#1}{\mathchar"7012}}%
}
\newcommand\wideacute[1]{%
  \mathpalette\@wideaccent{{#1}{\mathchar"7013}}%
}
\newcommand*\@wideaccent[2]{%
  \@@wideaccent{#1}#2%
}
\newcommand\@@wideaccent[3]{%
  \setbox\@tempboxa\hbox{$\m@th#1#2$}%
  \@tempdima=\ht\@tempboxa
  \@tempdimb=\wd\@tempboxa
  \ooalign{%
    \box\@tempboxa\cr
    \hidewidth\raise\dimexpr\@tempdima-1ex\relax\hbox{\resizebox{\@tempdimb}{\height}{$\m@th#1#3$}}\hidewidth
  }%
}
\makeatother

\begin{document}\noindent
\begin{tabular}{@{}l@{\ }l@{\ }l@{}}
  Originale Akzente: & \(\grave{a}\ \grave{l}\ \grave{z}\ \grave{A}\ \grave{Z}\ \grave{\alpha}\ \grave{\omega}\ \grave{\Gamma}\ \grave{\mathit{sum}}\ \grave{\mathit{lang}}\) & \(\acute{a}\ \acute{l}\ \acute{z}\ \acute{A}\ \acute{Z}\ \acute{\alpha}\ \acute{\omega}\ \acute{\Gamma}\ \acute{\mathit{sum}}\ \acute{\mathit{lang}}\)\\
Breite Akzente: & \(\widegrave{a}\ \widegrave{l}\ \widegrave{z}\ \widegrave{A}\ \widegrave{Z}\ \widegrave{\alpha}\ \widegrave{\omega}\ \widegrave{\Gamma}\ \widegrave{\mathit{sum}}\ \widegrave{\mathit{lang}}\) & \(\wideacute{a}\ \wideacute{l}\ \wideacute{z}\ \wideacute{A}\ \wideacute{Z}\ \wideacute{\alpha}\ \wideacute{\omega}\ \wideacute{\Gamma}\ \wideacute{\mathit{sum}}\ \wideacute{\mathit{lang}}\)\\
\end{tabular}
\end{document}