How can I conditionally designate an active quote in csquotes.cfg?

Upon seeing \MakeAutoQuote or \MakeAutoQuote*, csquotes defines \csq@string@<number> for both arguments in a suitable way. The <number> represents the decimal ASCII codes of the UTF-8 representation of the character, separated by periods if multibyte.

However, the package already provides the infrastructure for the conversion.

\begin{filecontents}{csquotes.cfg}
\MakeAutoQuote{‘}{’}
\MakeAutoQuote*{“}{”}
\end{filecontents}

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{csquotes}


\makeatletter
\def\ConditionalMakeAutoQuote#1#{%
  \def\cfr@star{#1}\CMAQ@
}
\def\CMAQ@#1#2{%
  \csq@ifutfchar{#1}
    {\csq@ifvalidutf{#1}
       {\ifcsundef{csq@string@\csq@number{#1}}
          {\expandafter\MakeAutoQuote\cfr@star{#1}{#2}}
          {}
       }%
       {\csq@err@utf}}
    {\csq@ifvalidchar{#1}
       {\ifcsundef{csq@string@\number`#1}
          {\expandafter\MakeAutoQuote\cfr@star{#1}{#2}}
          {}}%
       {\csq@err@char}}}
\makeatother

\ConditionalMakeAutoQuote{‘}{’}
\ConditionalMakeAutoQuote*{“}{”}

\begin{document}

‘abc’

“abc”

‘abc “abc” abc’

\end{document}

I get the same result, namely

with or without the csquotes.cfg file, which is read just after csquotes.def, so before any possible definition of quoting characters in the document.