Create a simple "scheme" environment and a "List of Schemes"

I have the majority of my thesis written and typeset. Currently, I have a List of Figures and a List of Tables.

However, now my committee tells me that I must also have a List of Schemes. In chemistry, a scheme is an environment that contains (images of) chemical structures and reactions.

Unfortunately, I have already coded my chemical structures as figures. There are a few packages, such as chemstyle and chemscheme, that appear to provide their own scheme constructs. However, I would prefer not to use them since some of those packages set their own defaults for things like chemical formulas. (For example, I see that the chemstyle package defines ie, but I already have my own definition for ie in my thesis.) I am already using the chemformula and chemmacros packages.

Is there any way I can more simply create my own Scheme environment? The only difference I need is that schemes should be captioned as "Scheme" and listed in a List of Schemes. In other words, the only difference between a figure and a scheme is in bookkeeping.

Here is my MWE, with several of the crucial packages that I’m using. One possible complication is that I use the subcaption package to create subfigures. Typically I have only one image per figure/scheme, but I create sub references using phantomsubcaption from the subcaption package. Also, I am using the tocloft package to adjust spacings in the lists of figures and tables, and that could potentially complicate things further.

Finally, it would be nice if I could use the new "scheme" environment with the cleveref package, since I use the cref command from that package a lot to refer to figures, tables, etc.

documentclass[oneside,11pt]{book}

usepackage[semibold,tt=false]{libertine}
usepackage{libertinust1math}
usepackage[font={sf,small},labelsep=quad,labelfont=sc]{caption}
usepackage[subrefformat=parens]{subcaption}
usepackage[
  expansion = false ,
  tracking = smallcaps ,
  letterspace = 40 ,
]{microtype}
usepackage{booktabs}
usepackage{acro}
acsetup{
  barriers/use, barriers/reset,
  use-id-as-short,
}
newcommand{ie}{i.e.}
newcommand{eg}{e.g.}
newcommand{cf}{cf.}
newcommand{avg}[1]{overline{#1}}
usepackage{mdframed}
usepackage[capitalize]{cleveref}
usepackage{chemformula}
setchemformula{charge-hshift=.5pt}
usepackage{chemmacros}
usepackage{graphicx}
usepackage{enumitem}
usepackage{calc}
usepackage{tabto}
usepackage[titles]{tocloft}
setlength{cftfignumwidth}{2.9em}
setlength{cfttabnumwidth}{2.9em}

begin{document}

addcontentsline{toc}{chapter}{listfigurename}
listoffigures

% phantomsection %% Remove if using hyperref
addcontentsline{toc}{chapter}{listtablename}
listoftables

chapter{First chapter}
Text in the first chapter.
Refer to cref{fig:firstfig} using cleveref package.
Refer to cref{tbl:firsttbl}.
Refer to cref{fig:multi}, cref{fig:multi:a}, and cref{fig:multi:b}.
Refer to eventual scheme, cref{scm:eventualscheme}.
Refer to eventual multi-part scheme, cref{scm:eventualmultischeme}.
% Example figure
begin{figure}[!h]
  centering
  includegraphics[width=0.02textwidth]{example-image}
  caption{Caption of figure in first chapter.}label{fig:firstfig}
end{figure}

% Example table 
begin{table}[!h]
  centering
  begin{tabular}{ll}
    toprule
    A & B
    bottomrule
  end{tabular}
  caption{Caption of table in first chapter.}label{tbl:firsttbl}
end{table}

% MULTIPART FIGURE 
begin{figure}[!h]
  centering
  begin{subfigure}{textwidth}
    centering
    includegraphics[width=0.02textwidth]{example-image}
    phantomsubcaptionlabel{fig:multi:a}
  end{subfigure}
  begin{subfigure}{0pt}
    phantomsubcaptionlabel{fig:multi:b}
  end{subfigure}
  caption{Caption of figure referring to parts subref{fig:multi:a} and subref{fig:multi:b} with subref command.}label{fig:multi}
end{figure}

% I NEED TO CHANGE THE FOLLOWING FIGURE TO A SCHEME (SINGLE-PART SCHEME)
begin{figure}[!h]
  centering
  includegraphics[width=0.02textwidth]{example-image-a}
  caption{Caption of eventual scheme.}label{scm:eventualscheme}
end{figure}

% I NEED TO CHANGE THE FOLLOWING FIGURE TO A SCHEME (MULTI-PART SCHEME, BUT ONLY WITH ONE IMAGE)
begin{figure}[!h]
  centering
  begin{subfigure}{textwidth}
    centering
    includegraphics[width=0.02textwidth]{example-image-b}
    phantomsubcaptionlabel{scm:eventualmultischeme:a}
  end{subfigure}
  begin{subfigure}{0pt}
    phantomsubcaptionlabel{scm:eventualmultischeme:a}
  end{subfigure}
  caption{Caption of eventual scheme referring to parts subref{fig:multi:a} and subref{fig:multi:b} with subref command.}label{scm:eventualmultischeme}
end{figure}

chapter{Second chapter}
Text in the second chapter.
Refer to cref{fig:secondfig}.
% Another example figure
begin{figure}[!h]
  centering
  includegraphics[width=0.02textwidth]{example-image}
  caption{Caption of figure in second chapter.}label{fig:secondfig}
end{figure}
end{document}