'condensed' bibliography for Encyclopedia references, but detailed citations?

Question

So, I've been eyeballing this answer but it doesn't quite get what I'm wanting. I'd like to get

Encyclopaedia Britannica, Vol. 2, “Babylonia and Assyria,” p. 849

in the footnote/endnote from \autocite[849]{britannica:babyloniaandassyria} and so on for other articles in other volumes and pages but only have

Encyclopaedia Britannica, Encyclopedia Britannica, Inc., Chicago, 1943, 175th Anniversary Edition

in the final \printbibliography output.

So, specific details in the citation itself, but just the whole encyclopaedia in the bibliography. Is this possible without an extreme amount of fnagling?

Current bib file snippet.

\documentclass[english,oneside,openany]{book}
\usepackage[citestyle=authortitle-ibid,backend=biber,ibidpage=false]{biblatex}
\usepackage{showframe}

\begin{filecontents}{\jobname.bib}
@mvreference{encyclopaedia:britannica,
    address = {Chicago},
    author = {{Encyclopedia Britannica, Inc.}},
    edition = {175th Anniversary Edition},
    options = {useeditor=false},
    title = {Encyclopaedia Britannica},
    volumes = {24},
    year = {1943}
}

@inreference{britannica:babyloniaandassyria,
    crossref = {encyclopaedia:britannica},
    title = {Babylonia and Assyria},
    volume = {2},
}

@inreference{britannica:david,
    crossref = {encyclopaedia:britannica},
    title = {David},
    volume = {7},
}
\end{filecontents}
\addbibresource{\jobname.bib}

\DeclareFieldFormat[inreference]{citetitle}{\mkbibquote{#1\isdot}}
\DeclareFieldFormat[inreference]{title}{\mkbibquote{#1\isdot}}

\begin{document}

    \autocite[849]{britannica:babyloniaandassyria}
    \autocite[75]{britannica:david}

    \printbibliography

\end{document}

Results in:

Answer 1

You can declare a source map and use the options skipbib and skiplab for the entries with crossref equal to encyclopaedia:britannica.

From BibLaTeX manual:

skipbib=true, false default: false If this option is enabled, the entry is excluded from the bibliography but it may still be cited. This option is also settable on a per-type basis.

skiplab=true, false default: false If this option is enabled, biblatex will not assign any labels to the entry. It is not required for normal operation. Use it with care. If enabled, biblatex can not guarantee unique citations for the respective entry and citations styles which require labels may fail to create valid citations for the entry. This option is also settable on a per-type basis.

\documentclass[english,oneside,openany]{book}
\usepackage[citestyle=authortitle-ibid,backend=biber,ibidpage=false]{biblatex}

\begin{filecontents}{\jobname.bib}
@mvreference{encyclopaedia:britannica,
    address = {Chicago},
    author = {{Encyclopedia Britannica, Inc.}},
    edition = {175th Anniversary Edition},
    options = {useeditor=false},
    title = {Encyclopaedia Britannica},
    volumes = {24},
    year = {1943}
}

@inreference{britannica:babyloniaandassyria,
    crossref = {encyclopaedia:britannica},
    title = {Babylonia and Assyria},
    volume = {2},
    options      = {skipbib}
}

@inreference{britannica:david,
    crossref = {encyclopaedia:britannica},
    title = {David},
    volume = {7},
    options      = {skipbib}
}
\end{filecontents}
\addbibresource{\jobname.bib}

\DeclareFieldFormat[inreference]{citetitle}{\mkbibquote{#1\isdot}}
\DeclareFieldFormat[inreference]{title}{\mkbibquote{#1\isdot}}

\DeclareSourcemap{
  \maps{
    \map{ 
      \step[fieldsource=crossref,
        match={encyclopaedia:britannica},
        fieldset=options,
        fieldvalue={skipbib,skiplab}]
    }
  }
}
 
\begin{document}
    \autocite[849]{britannica:babyloniaandassyria}
    \autocite[75]{britannica:david}
    
    \printbibliography
\end{document}