patchcmd, #1 as hook, and AtEndPreamble

Question

I'm trying to patch some bidi footnote commands (\@footnotetext, \@LTRfootnotetext, and \@RTLfootnotetext) in biblatex.

The footnote patching commands in biblatex occur in an AtEndPreamble macro in biblatex.sty.

And I'm trying to use #1 as a hook in \patchcmd.

This is a combination which fails, and I'm looking for ideas as to the best way around the problem.

MWE:

\documentclass{article}
\usepackage{etoolbox}
\usepackage{bidi}
\tracingpatches
\newtoggle{blx@footnote}
\makeatletter
\AtEndPreamble{%
  \patchcmd\@footnotetext
    {#1}
    {\toggletrue{blx@footnote}#1}
    {\def\patchresult{success}}
    {\def\patchresult{failure}}}%
\makeatother
\begin{document}
\patchresult
\end{document}

\@footnotetext is defined this way in bidi:

\long\def\@footnotetext#1{%
  \footdir@write
  \footdir@fntext{\bidi@footdir@footnote}%
  \stepcounter{footdir@label}%
  \footdir@fntext{\bidi@footdir@footnote}%
  \footdir@toks{#1}%
  \footdir@toks\expandafter
    {\the\expandafter\footdir@toks
     \expandafter \zref@labelbyprops
     \expandafter{\thefootdir@label}{abspage}}%
     \expandafter\footdir@ORG@bidi@footnotetext
     \expandafter{\the\footdir@toks}}

This is in order to fix issue #412 in biblatex. See https://github.com/plk/biblatex/issues/412

patchcmd, #1 as hook, and AtEndPreamble

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