How to Replace Page Numbers by Item Numbers in the Index

Question

Consider the MWE

\documentclass{article}
\hoffset 10pt \voffset -45pt
\oddsidemargin 12pt \evensidemargin 10pt \topmargin 35pt
\headheight 25pt \textheight 8.35in \textwidth 6.25in
\headsep 25pt \marginparwidth 35pt
\usepackage{color}
\definecolor{RoyalRed}{RGB}{157,16, 45}
\usepackage{imakeidx}
\makeindex
\usepackage{idxlayout}
\usepackage{lipsum}
\usepackage{multicol}
\setlength{\columnsep}{1cm}
\usepackage{scalefnt}
\usepackage{amssymb}
%\usepackage{pgfpages}
%\pgfpagesuselayout{2 on 1}
% % The colored box that encloses the item number.
\usepackage{tcolorbox}
\newtcbox{\logo}{nobeforeafter, notitle, %sharpcorners,
    colframe=red!75!black,
    colback=red!75!black,
    top=.75pt,
    left=1pt,
    right=1pt,
    bottom=.5pt,
    fontupper=\sffamily\bfseries,
    tcbox raise base}
\parindent 0pt
% % FANCY ENUMERATE positioning the enumerated colored box above the text.
\newcounter{cenum}
\newcommand\cenumsep{}

\newenvironment{cenumerate}{%
    \setcounter{cenum}{0}%
    \setlength\parskip\bigskipamount
    %  \begin{center}%
}{%
    %  \end{center}%
}
\newcommand\citemx[1]{% added <<<<<<<<<<<<<<
\refstepcounter{cenum}%
\par\cenumsep\logo{\textcolor{white}{\arabic{cenum}}}%
%\par\cenumsep\logo{\arabic{cenum}}%
\begin{minipage}{\linewidth} % added <<<<<<<<<<<<<<<<
    \hspace{12pt}#1  % left/right space
    \vspace{0.5ex}% vertical adjustment
\end{minipage}
\par\nobreak\vskip-\parskip\medskip\noindent\ignorespaces% \medskip is the distance between label and text, change as needed
}
% NEW SYMBOL DEFINITIONS
\newcommand{\R}{\textcolor{red}{{\scalefont{1.25}{$\bullet\hspace{.15em}$}}}}
\newcommand{\B}{\textcolor{blue}{{\scalefont{1.25}{$\bullet\hspace{.15em}$}}}}
%\usepackage{showframe}
\begin{document}
    %\large
\begin{multicols}{2}

%\setlength\itemsep{1em plus 1fil}
%\interlinepenalty=10000
        \begin{cenumerate}
            \citemx{\R\R\B\B \hspace{.08em} \B\R\R\B \hspace{.08em} \R\R\R\R} \lipsum[4] \index{Entry item i}
        \citemx{\B\B\B\B \hspace*{.08em} \R\R\R\B \hspace*{.08em} \R\B\R\R} \lipsum[1] \index{Entry item ii}

        \citemx{\B\B\B\B \hspace*{.08em} \R\R\R\B \hspace*{.08em} \R\B\R\R} \lipsum[2] \index{Entry item iii}

        \citemx{\B\B\B\B \hspace*{.08em} \R\R\R\B \hspace*{.08em} \R\B\R\R} \lipsum[5] \index{Entry item iv}

        \citemx{\B\B\B\B \hspace*{.08em} \R\R\R\B \hspace*{.08em} \R\B\R\R} \lipsum[5] \index{Entry item v}

        \citemx{\B\B\B\B \hspace*{.08em} \R\R\R\B \hspace*{.08em} \R\B\R\R} \lipsum[1] \index{Entry item vi}

        \citemx{\B\B\B\B \hspace*{.08em} \R\R\R\B \hspace*{.08em} \R\B\R\R} \lipsum[5] \index{Entry item vii}

        \citemx{\B\B\B\B \hspace*{.08em} \R\R\R\B \hspace*{.08em} \R\B\R\R} \lipsum[5] \index{Entry item viii}
    \end{cenumerate}
\end{multicols}


\idxlayout{columns=1}
\printindex
\vspace{1cm}\centering\large Instead of page numbers, I would like item (i.e., citemx) numbers.

\end{document}

which produces (only some pictured) the customized itemization

In the actual document, I anticipate there will be hundreds of such items containing actual, as well as coded descriptions of each item---with several items on each page. Thus, an index that displays the item number rather than the page number is desired.

The index produced by the MWE is

QUESTION: How may the code given in the MWE be modified in order for the Index to display items (\citemx numbers) instead of page numbers for each index item?

Thank you.