Thought I'd have a go ...
Using Drawing on an image with TikZ, I took your "desirable" krul symbol and drew on it until I had something that looked fairly similar. I used the hobby
package to define the béziers rather than fiddling with control points (to avoid recomputing the path each time the symbol is used, I used a nifty feature of the hobby
package that allows for reuse of a hobbily defined path; a bit of box magic puts the definition at the start of the document without - I hope - taking up any space).
The key feature of this implementation is the use of the calligraphy
package to style the lines. This, in my opinion, makes it look more like a letter drawn with a pen than a squiggle.
For added bonus, I made it scale according to the fontsize.
\documentclass{article}
%\url{https://tex.stackexchange.com/q/313281/86}
% Uses:
%\url{https://tex.stackexchange.com/q/54771/86} (hobby package)
%\url{https://tex.stackexchange.com/q/16899/86} (calligraphy)
\usepackage{tikz}
\usetikzlibrary{calligraphy,hobby}
\AtBeginDocument{%
\setbox0=\vbox{\tikz \path[use Hobby shortcut,save Hobby path={krul}] (-.2,0.25) .. (0,.45) .. (.2,.65) .. (0.3,0.76) .. (0.4,.97) .. (.1,.8) .. (.05,.65) .. (.3,.5) .. (.3,.4) .. (.15,.1) .. (.15,.05) .. (.3,.05) .. (1,.7);}%
}
\newcommand{\krul}{%
\tikz[scale=1em/1cm] \calligraphy[copperplate,restore and use Hobby path={krul}{}];%
}
\begin{document}
This statement is true \krul
{\Large This statement is true \krul }
{\Huge This statement is true \krul }
\end{document}
