How to tweak biblatex-chicago to include full page range in first citation even when citing a specific page

Question

By default, biblatex-chicago (in Author-Title mode) cites @articles and @incollections the first time with a full page range UNLESS the cite command includes a specific page citation, in which case only the latter is printed.

How can I tweak the style to make first-time citations print the full page range followed, when applicable, by comma + "at" + the specific page/pages cited? (When the first-time citation has no page citation, the output would be identical.)

MWE:

\documentclass{article}
\usepackage[notes]{biblatex-chicago}
\addbibresource{biblatex-examples.bib}
\begin{document}
\cite[162]{hyman}.
\cite[220--222]{doody}.
\cite[163]{hyman}.
\cite[223]{doody}.
\end{document}

Default output:

Arthur Hyman, “Aristotle’s Theory of the Intellect and its Interpretation by Averroes,” in Studies in Aristotle, ed. Dominic J. O’Meara, Studies in Philosophy and the History of Philosophy 9 (Washington, D.C.: The Catholic University of America Press, 1981), 162.

Terrence Doody, “Hemingway’s Style and Jake’s Narration,” The Journal of Narrative Technique 4, no. 3 (1974): 220–222.

Hyman, “Aristotle’s Theory of the Intellect,” 163. Doody, “Hemingway’s Style and Jake’s Narration,” 223.

Desired output (boldface added to mark the differences):

Arthur Hyman, “Aristotle’s Theory of the Intellect and its Interpretation by Averroes,” in Studies in Aristotle, ed. Dominic J. O’Meara, Studies in Philosophy and the History of Philosophy 9 (Washington, D.C.: The Catholic University of America Press, 1981), 161–191, at 162.

Terrence Doody, “Hemingway’s Style and Jake’s Narration,” The Journal of Narrative Technique 4, no. 3 (1974): 212–225, at 220–222.

Hyman, “Aristotle’s Theory of the Intellect,” 163. Doody, “Hemingway’s Style and Jake’s Narration,” 223.

Answer 1

The standard verbose styles have an option called citepages for that. biblatex-chicago does not appear to have a similar option.

Something like the following appears to work, but as always, it is tricky to modify a highly customised style like biblatex-chicago.

\documentclass{article}
\usepackage[notes]{biblatex-chicago}
\DefineBibliographyStrings{english}{
  thiscite = {at},
}
\newtoggle{cbxchic:hadpages}
\renewbibmacro*{fullpostnote}{%
  \global\toggletrue{cbxchic:hadpages}%
  \iffieldundef{chapter}%
   {\iffieldundef{pages}%
      {\global\togglefalse{cbxchic:hadpages}}%
      {\postnotedelim%
        \printfield{pages}}}%
   {\postnotedelim%
    \printfield{chapter}}%
  \ifboolexpr{
      test {\ifnumequal{\value{citecount}}{\value{citetotal}}}
      and
      test {\iffieldpages{postnote}}
      and
      togl {cbxchic:hadpages}
    }
    {\setunit{\addcomma\space}%
     \bibstring{thiscite}%
     \setunit{\addspace}}
    {}%
  \usebibmacro{semel:postnote}}
\renewbibmacro*{eid+fullpostnote}{%
  \global\toggletrue{cbxchic:hadpages}%
  \iffieldundef{chapter}%
    {\iffieldundef{pages}%
      {\iffieldundef{eid}%
        {\global\togglefalse{cbxchic:hadpages}}%
        {\postnotedelim%
          \printfield{eid}%
          \clearfield{eid}}}%
      {\postnotedelim%
        \printfield{pages}}}%
    {\postnotedelim%
      \printfield{chapter}}%
  \ifboolexpr{
      test {\ifnumequal{\value{citecount}}{\value{citetotal}}}
      and
      test {\iffieldpages{postnote}}
      and
      togl {cbxchic:hadpages}
    }
    {\setunit{\addcomma\space}%
     \bibstring{thiscite}%
     \setunit{\addspace}}
    {}%
  \usebibmacro{semel:postnote}}
\addbibresource{biblatex-examples.bib}
\begin{document}
\cite[162]{hyman}.
\cite[220--222]{doody}.
\cite[163]{hyman}.
\cite[223]{doody}.
\end{document}