Gwbar

\documentclass{scrreprt}


\usepackage[
	% headsepline,  % En-/disable for checks with the GW headline
]{scrlayer-scrpage}
\clearmainofpairofpagestyles
\setlength{\headheight}{\baselineskip}


% -- Now use the package
% -- NOTE: since .sty and .txt are not in same directory, we have to give
% -- the templatefile argument and use ../gwbar
\usepackage[
	templatefile="../code/generic_template.txt",
	% templatefile="../code/eccentric_template.txt",
    declaretitlebox=false,
	progressbar=false,
]{../gwbar}


\ihead{%
	\gwbar[%
		% -- Potentially Different Options
	]%
	Test Header%
}
% -- NOTE: this is the intended way of using the command. \ohead or \head would
% -- work as well, but only with some extra work (see the file alignment_example).


\begin{document}

Hello there

\end{document}