[Tex/LaTex] beamer+biblatex: change the \footnotemark style of \footcite

Question

Is it possible to change the \footnotemark style created by \footcite (from biblatex) so that it looks more like a citation symbol?

I want to keep my references as footnotes, but I would like them to look more like actual citations.

MWE:

% arara: pdflatex
% arara: bibtex
% arara: pdflatex
% arara: pdflatex
% arara: clean: {files:[temp.aux, temp.bbl, temp.bib, temp.blg, temp.log, temp.nav, temp.out, temp.run.xml, temp.snm, temp.toc, temp-blx.bib]}

\documentclass{beamer}

\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@article{greenwade93,
    author  = "George D. Greenwade",
    title   = "The {C}omprehensive {T}ex {A}rchive {N}etwork ({CTAN})",
    year    = "1993",
    journal = "TUGBoat",
    volume  = "14",
    number  = "3",
    pages   = "342--351"
}
@book{goossens93,
    author    = "Michel Goossens and Frank Mittelbach and Alexander Samarin",
    title     = "The LaTeX Companion",
    year      = "1993",
    publisher = "Addison-Wesley",
    address   = "Reading, Massachusetts"
}
\end{filecontents}

\usepackage[english]{babel}
\usepackage[backend=bibtex, style=verbose]{biblatex}
\addbibresource{\jobname}

\begin{document}

\begin{frame}
Bla bla bla \footcite{greenwade93} Ble ble ble \footcite{goossens93}
\end{frame}

\end{document}

NOTE 1: There are many questions on tex.stackexchange.com about changing the style of the footnote style. This is about the footnotemark itself.

NOTE 2: I don't use footnotes for anything else, so I don't mind changing the footnotemark directly, ignoring whether it was created by footcite or not. I just could not find how to customize footnotemarks this way…

Answer 1

As you don't use footnotes for anything else, you can modify \@makefnmark (this is what \insertfootnotemark calls)

% arara: pdflatex
% arara: bibtex
% arara: pdflatex
% arara: pdflatex
% arara: clean: {files:[temp.aux, temp.bbl, temp.bib, temp.blg, temp.log, temp.nav, temp.out, temp.run.xml, temp.snm, temp.toc, temp-blx.bib]}

\documentclass{beamer}

\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
    @article{greenwade93,
        author  = "George D. Greenwade",
        title   = "The {C}omprehensive {T}ex {A}rchive {N}etwork ({CTAN})",
        year    = "1993",
        journal = "TUGBoat",
        volume  = "14",
        number  = "3",
        pages   = "342--351"
    }
    @book{goossens93,
        author    = "Michel Goossens and Frank Mittelbach and Alexander Samarin",
        title     = "The LaTeX Companion",
        year      = "1993",
        publisher = "Addison-Wesley",
        address   = "Reading, Massachusetts"
    }
\end{filecontents}

\usepackage[english]{babel}
\usepackage[backend=bibtex, style=verbose]{biblatex}
\addbibresource{\jobname}

\makeatletter
    \def\@makefnmark{\hbox{{{\usebeamercolor[fg]{footnote mark}\usebeamerfont*{footnote mark} [\@thefnmark]}}}}

    \def\@makefntext#1{%
        \def\insertfootnotetext{ #1}%
        \def\insertfootnotemark{\@makefnmark}%
        \usebeamertemplate***{footnote}}    
\makeatother

\begin{document}

    \begin{frame}
        Bla bla bla \footcite{greenwade93} Ble ble ble \footcite{goossens93}
    \end{frame}

\end{document}