How to avoid printing \part pages in Legrand Orange Book?

Question

I am trying to remove the \part pages from my output as it is a needless feature.
The class has a custom command producing and printing the graphics and pages, but if I comment out parts of it or the whole block, it breaks my document in other places.

%Command to create and output the parts pages
\newcommand{\outputpartpage}[2]{
    \begin{tikzpicture}[remember picture, overlay]
        \node[anchor=center, rectangle, fill=ocre!20, inner sep=0pt, minimum height=\paperheight, minimum width=\paperwidth] at (current page.center) {}; % Background color
        \node[anchor=north west, inner sep=0pt, xshift=\Gm@lmargin, yshift=-\Gm@tmargin] at (current page.north west) {\fontsize{220pt}{220pt}\selectfont\sffamily\bfseries\textcolor{ocre!40}{#1}}; % Part number
        \node[anchor=north east, inner sep=0pt, xshift=-\Gm@rmargin, yshift=-\Gm@tmargin] at (current page.north east) {\fontsize{30pt}{30pt}\selectfont\sffamily\bfseries\textcolor{white}{\strut #2}}; % Part title
        \node[anchor=south east, inner sep=0pt, xshift=-\Gm@rmargin, yshift=\Gm@bmargin] at (current page.south east) { % Mini table of contents
            \parbox[t][][t]{8.5cm}{ % Width of box holding the mini ToC
                \printcontents[part]{l}{0}{\setcounter{tocdepth}{1}} % Display the mini table of contents showing chapters and sections, change tocdepth to 2 to also show %subsections or 0 to only show chapters
            }
        };
    \end{tikzpicture}
}
\renewcommand{\part}[1]{\addcontentsline{toc}{part}{#1}}

\titleformat
    {\part} % Section type being modified
    [block] % Shape type, can be: hang, block, display, runin, leftmargin, rightmargin, drop, wrap, frame
    {\startcontents[part]\outputpartpage{\thepart}{#1}} % Format of the whole section
    {} % Format of the section label
    {0em} % Space between the title and label
    {} % Code before the label
    [] % Code after the label

I have also tried to avoid using the \part command totally and use

\addtocounter{part}{1}
\addcontentsline{toc}{part}{Guidance document}{\protect\numberline{\thepart}

But this breaks the display of part numbers in TOC as seen below:

Is there another way please?

Answer 1

UPDATE To suppress the part page, while keeping the ToC style, add before \begin{document}

\newcounter{partx}
\renewcommand{\thepartx}{\Roman{partx}}
\newcommand{\partx}[1]{%
\stepcounter{partx}
\addcontentsline{toc}{part}{\protect\numberline{\thepartx}#1}

and use the command \partx{<part title>} instead of \part like

\partx{Guidance document}