Leave pages-field out of bib-entry with incollection, if pages given when quoting

Question

Since two users here were already a great help to my last question, here a new problem that came along. If I quote an incolletion or inbook the first time (verbose setting), it will print the pages of the .bib-file. But if you quote something, you usually have to give the exact page-number for that quote. So I'd like to leave the pages-field from the .bib-File empty, if I give the \cite my own page-number. I can't leave out the pages-field of the .bib-File, since the pages have to show up in the bibliography. So I've got this: There's twice a page-reference now, once from the .bib-entry, once manually from the \footcite-command. So I'd like to leave the 2610-2613 away and print only the 15. I hope that's somehow doable, so here my MWE:

\documentclass[11pt, a4paper]{scrreprt} %Inhaltsverzeichnis andere Schrift.. bei report normal
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage{filecontents}
\begin{filecontents}{test.bib}
    @inbook{Kline:Commune,
        author = {Kline, Michael and Nilsen, Micheline},
        title = {Paris Commune, 1871},
        editor = {Ness, Immanuel and Herz, Jonah},
        booktitle = {The International Encyclopedia of Revolution and Protest},
        booksubtitle = {1500 to the Present},
        volume = {5},
        pages = {2610--2613},
        date = {2009},
        location = {Chichester},
    }
\end{filecontents}

%=============BIBLIOGRAPHIE, ZITIERWEISE=================== %
\usepackage[babel,german=guillemets]{csquotes}
\usepackage[%
style=alphabetic,
style=verbose-ibid,
labeldate,
dashed=false, %bei mehreren Werken desselben Autors kein Strich
backend=bibtex8,
idemtracker=false,
ibidtracker=constrict,
]{biblatex}

\usepackage{xpatch}

%Hg. bzw Hgg. in Klammern hinter Herausgeber, statt davor und vor Titel
\renewbibmacro*{byeditor+others}{%
    \ifnameundef{editor}
    {}
    {\printnames[byeditor]{editor}%
        \setunit{\addspace}%
        \usebibmacro{editor+othersstrg}%
        \clearname{editor}%
        \newunit}%
    \usebibmacro{byeditorx}%
    \usebibmacro{bytranslator+others}
    \setunit{\addcolon\space}
    \usebibmacro{booktitle}}
\xpatchbibmacro{byeditor+othersstrg}{\printtext}{\printtext[parens]}{}{}

\DefineBibliographyStrings{german}{%
    andothers = {et\ al\adddot}, %et al. statt u.a.
    editor = {\mkbibparens{Hg\adddot}}, %Hg. statt Hrsg.
    editors = {\mkbibparens{Hgg\adddot}}, %Hgg. plural
    byeditor = {\mkbibparens {Hg\adddot}}, 
}
\DeclareFieldFormat{postnote}{#1} %unterdrückt Präfix S.
\DeclareFieldFormat{multipostnote}{#1} %unterdrückt Präfix S.
\DeclareNameAlias{default}{last-first} %Autoren immer Nachname, Vorname sortieren
\renewbibmacro*{cite:short}{%
    \printnames{labelname}%
    \setunit*{\nameyeardelim}%
    \iffieldundef{labelyear}
    {}
    {\printtext[\addcolon]{\printtext[bibhyperlink]{%
                \printfield{labelyear}%
                \printfield{extrayear}}}}}
%\DeclareNameFormat{default}{%
%\usebibmacro{name:last-first}{#1}{#3}{#5}{#7}%
%\usebibmacro{name:andothers}}
\renewcommand{\multinamedelim}{\addsemicolon\space} %Semikolon zum trennen der Autoren
\renewcommand{\finalnamedelim}{\addsemicolon\space}
\renewcommand{\labelnamepunct}{\addcolon\space} %Zwischen Autor und Titel Doppelpunkt, kein Punkt
\renewcommand{\postnotedelim}{\addcolon\space} %Zwischen Jahrzahl und Seitenzahl Doppelpunkt, kein Komma
\renewcommand{\nametitledelim}{\addspace}
\renewbibmacro*{publisher+location+date}{% %Zwischen Ort und Jahr kein Komma
    \printlist{location}%
    {\setunit*{\addspace}}
    \usebibmacro{date}%
    \newunit}

\renewbibmacro*{maintitle+booktitle}{%
    \iffieldundef{maintitle}
    {}
    {\usebibmacro{maintitle}%
        \newunit\newblock
        \iffieldundef{volume}
        {}
        {\printfield{volume}%
            \printfield{part}%
            \setunit{\addcolon\space}}}%
    %\usebibmacro{booktitle}%
    \newunit}

\xpatchbibdriver{inbook}{%
    \usebibmacro{maintitle+booktitle}%
    \newunit\newblock
    \usebibmacro{byeditor+others}%
}%
{%
    \usebibmacro{byeditor+others}%
    \setunit{\addcolon\space}\newblock
    \usebibmacro{maintitle+booktitle}%
}%
{}{}%

\xpatchbibdriver{inbook}{%
    \newunit\newblock
    \usebibmacro{chapter+pages}%
}%
{%
    \addcolon\space
    \usebibmacro{chapter+pages}%
}%
{}{}

\xpatchbibdriver{inbook}{%
    \newunit
    \iffieldundef{maintitle}
}%
{%
    \setunit{\addcomma\space}
    \iffieldundef{maintitle}
}%
{}{}

\xpatchbibdriver{incollection}{%
    \usebibmacro{maintitle+booktitle}%
    \newunit\newblock
    \usebibmacro{byeditor+others}%
}%
{%
    \usebibmacro{byeditor+others}%
    \setunit{\addcolon\space}\newblock
    \usebibmacro{maintitle+booktitle}%
}%
{}{}%

\xpatchbibdriver{incollection}{%
    \newunit\newblock
    \usebibmacro{chapter+pages}%
}%
{%
    \addcolon\space
    \usebibmacro{chapter+pages}%
}%
{}{}

\xpatchbibdriver{incollection}{%
    \newunit
    \iffieldundef{maintitle}
}%
{%
    \setunit{\addcomma\space}
    \iffieldundef{maintitle}
}%
{}{}

%Titel nicht in Anführungszeichen; S. vor Seitenangabe entfernen
\DeclareFieldFormat[inbook]{title}{#1}
\DeclareFieldFormat[inbook]{pages}{#1}
\DeclareFieldFormat[incollection]{title}{#1} 
\DeclareFieldFormat[incollection]{pages}{#1}
\DeclareFieldFormat[article]{title}{#1}
\DeclareFieldFormat[article]{pages}{#1}


%\renewcommand{\nametitledelim}{\space}

\bibliography{test} %name des .bib-Files

% Titel nicht schräg
\DeclareFieldFormat{title}{#1}
\DeclareFieldFormat{citetitle}{#1}
\DeclareFieldFormat{booktitle}{#1}
\DeclareFieldFormat{maintitle}{#1}

% Journal Titel nicht schräg
\DeclareFieldFormat{journaltitle}{#1}

%=============ENDE BIBLIOGRAPHIE, ZITIERWEISE=================== %
\begin{document}
    Test\footcite[15]{Kline:Commune}

    \printbibliography
\end{document}

Answer 1

As @moewe said: citepages=omit will print the cited pages if needed and print the pages-entry from the .bib-File if left out.