biblatex style to be able to use the numeric style in one section and the alphabetic in another

alphanumeric-hybrid.bbx

% This is an unholy mashup of the numeric.bbx and alphabetic.bbx files from
% the standard biblatex distribution, made so we can switch between numeric
% style for the main body and alphabetic style for the appendix.
\ProvidesFile{alphanumeric-hybrid.bbx}
[\abx@bbxid]

\RequireBibliographyStyle{standard}
\ExecuteBibliographyOptions{labelalpha,labelnumber,sorting=anyt}

% To use the alphabetic section in one refsection, \setbool{bbx:alpha}{true} at the start;
% to switch back, \setbool{bbx:alpha}{false}.
\providebool{bbx:alpha}

\DeclareNameAlias{author}{default}
\DeclareNameAlias{editor}{default}
\DeclareNameAlias{translator}{default}

\DeclareFieldFormat{labelalphawidth}{\mkbibbrackets{#1}}
\DeclareFieldFormat{labelnumberwidth}{\mkbibbrackets{#1}}
\DeclareFieldFormat{shorthandwidth}{\mkbibbrackets{#1}}

\defbibenvironment{bibliography}
  {\list
     {\ifbool{bbx:alpha}{%
        \printtext[labelalphawidth]{%
          \printfield{prefixnumber}%
          \printfield{labelalpha}%
          \printfield{extraalpha}%
        }%
     }{%
        \printtext[labelnumberwidth]{%
          \printfield{prefixnumber}%
          \printfield{labelnumber}%
        }%
     }}
     {\setlength{\labelwidth}{\ifbool{bbx:alpha}{\labelalphawidth}{\labelnumberwidth}}%
      \setlength{\leftmargin}{\labelwidth}%
      \setlength{\labelsep}{\biblabelsep}%
      \addtolength{\leftmargin}{\labelsep}%
      \setlength{\itemsep}{\bibitemsep}%
      \setlength{\parsep}{\bibparsep}}%
      \ifbool{bbx:alpha}{%
        \renewcommand*{\makelabel}[1]{##1\hss}%
      }{%
        \renewcommand*{\makelabel}[1]{\hss##1}%
      }}
  {\endlist}
  {\item}

\defbibenvironment{shorthands}
  {\list
     {\printfield[shorthandwidth]{shorthand}}
     {\setlength{\labelwidth}{\shorthandwidth}%
      \setlength{\leftmargin}{\labelwidth}%
      \setlength{\labelsep}{\biblabelsep}%
      \addtolength{\leftmargin}{\labelsep}%
      \setlength{\itemsep}{\bibitemsep}%
      \setlength{\parsep}{\bibparsep}%
      \ifbool{bbx:alpha}{%
        \renewcommand*{\makelabel}[1]{##1\hss}%
      }{%
        \renewcommand*{\makelabel}[1]{\hss##1}%
      }}}
  {\endlist}
  {\item}

\endinput

alphanumeric-hybrid.cbx

\ProvidesFile{alphanumeric-hybrid.cbx}
[\abx@cbxid]

\ExecuteBibliographyOptions{labelalpha,labelnumber,autocite=inline}

\renewcommand*{\multicitedelim}{\ifbool{bbx:alpha}{\addsemicolon}{\addcomma}\space}
\renewcommand*{\iffinalcitedelim}{%
  \ifnumequal{\value{textcitecount}}{\value{textcitetotal}-1}}

\providebool{bbx:alpha}
\newbool{cbx:parens}

\newbibmacro*{cite}{%
  \printtext[bibhyperref]{%
    \printfield{prefixnumber}%
    \ifbool{bbx:alpha}{%
      \printfield{labelalpha}%
      \printfield{extraalpha}%
    }{%
      \printfield{labelnumber}%
    }}}

\newbibmacro*{textcite}{%
  \iffieldequals{namehash}{\cbx@lasthash}
    {\setunit{\multicitedelim}}
    {\ifnameundef{labelname}
       {\printfield[citetitle]{labeltitle}}
       {\printnames{labelname}}%
     \setunit{%
       \global\booltrue{cbx:parens}%
       \addspace\bibopenbracket}%
     \stepcounter{textcitecount}%
     \savefield{namehash}{\cbx@lasthash}}%
  \ifnumequal{\value{citecount}}{1}
    {\usebibmacro{prenote}}
    {}%
  \usebibmacro{cite}%
  \setunit{%
    \ifbool{cbx:parens}
      {\bibcloseparen\global\boolfalse{cbx:parens}}
      {}%
    \textcitedelim}}

\newbibmacro*{textcite:init}{%
  \ifnumless{\value{multicitecount}}{2}
    {\global\boolfalse{cbx:parens}%
     \global\undef\cbx@lasthash}
    {\global\undef\cbx@lasthash}}

\newbibmacro*{textcite:postnote}{%
  \usebibmacro{postnote}%
  \ifthenelse{\value{multicitecount}=\value{multicitetotal}}
    {\setunit{}%
     \printtext{%
       \ifbool{cbx:parens}
         {\bibcloseparen\global\boolfalse{cbx:parens}}
         {}}}
    {\setunit{%
       \ifbool{cbx:parens}
         {\bibcloseparen\global\boolfalse{cbx:parens}}
         {}%
       \textcitedelim}}}

\DeclareCiteCommand{\cite}[\mkbibbrackets]
  {\usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite}}
  {\multicitedelim}
  {\usebibmacro{postnote}}

\DeclareCiteCommand{\parencite}[\mkbibbrackets]
  {\usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite}}
  {\multicitedelim}
  {\usebibmacro{postnote}}

\DeclareCiteCommand{\footcite}[\mkbibfootnote]
  {\usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite}}
  {\multicitedelim}
  {\usebibmacro{postnote}}

\DeclareCiteCommand{\footcitetext}[\mkbibfootnotetext]
  {\usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite}}
  {\multicitedelim}
  {\usebibmacro{postnote}}

\DeclareCiteCommand{\smartcite}[\iffootnote\mkbibbrackets\mkbibfootnote]
  {\usebibmacro{prenote}}
  {\usebibmacro{citeindex}%
   \usebibmacro{cite}}
  {\multicitedelim}
  {\usebibmacro{postnote}}

\DeclareCiteCommand{\cbx@textcite}
  {\usebibmacro{textcite:init}}
  {\usebibmacro{citeindex}%
   \usebibmacro{textcite}}
  {}
  {\usebibmacro{textcite:postnote}}

\DeclareCiteCommand{\textcite}[\cbx@textcite@init\cbx@textcite]
  {\gdef\cbx@savedkeys{}%
   \citetrackerfalse%
   \pagetrackerfalse%
   \DeferNextCitekeyHook%
   \usebibmacro{textcite:init}}
  {\ifthenelse{\iffirstcitekey\AND\value{multicitetotal}>0}
     {\protected@xappto\cbx@savedcites{()(\thefield{multipostnote})}%
      \global\clearfield{multipostnote}}
     {}%
   \xappto\cbx@savedkeys{\thefield{entrykey},}%
   \iffieldequals{namehash}{\cbx@lasthash}
     {}
     {\stepcounter{textcitetotal}%
      \savefield{namehash}{\cbx@lasthash}}}
  {}
  {\protected@xappto\cbx@savedcites{%
     [\thefield{prenote}][\thefield{postnote}]{\cbx@savedkeys}}}

\newrobustcmd{\cbx@textcite@init}[2]{%
  \setcounter{textcitetotal}{0}%
  \setcounter{textcitecount}{0}%
  \def\cbx@savedcites{#1}#2\cbx@savedcites\empty}

\DeclareMultiCiteCommand{\cbx@textcites}{\cbx@textcite}{}
\DeclareMultiCiteCommand{\textcites}[\cbx@textcites@init\cbx@textcites]{\textcite}{}

\let\cbx@textcites@init\cbx@textcite@init
\pretocmd{\cbx@textcites@init}{\UseNextMultiCiteHook}{}{}

\DeclareMultiCiteCommand{\cites}[\mkbibbrackets]{\cite}{\multicitedelim}
\DeclareMultiCiteCommand{\parencites}[\mkbibbrackets]{\parencite}{\multicitedelim}
\DeclareMultiCiteCommand{\smartcites}[\iffootnote\mkbibbrackets\mkbibfootnote]
  {\smartcite}{\multicitedelim}

\endinput