::Save as whatever.bat in same folder as pp2.exe and put your mods in that folder too, then double-click to run.
::Pipe dreams: GUI, search for and use *any* PLAY/MAKE folders instead of AA2_ prefix.
::Quirks: pp2.exe crashes if the PLAY/MAKE dirs end with \ and if a bogus MAKE directory is given (neither should happen here).
@echo off

set sevenz="%PROGRAMFILES%\7-Zip\7z.exe"

if NOT [%1]==[] (
    call :f_Repack %1
    goto:EOF
)
ELSE (
    for %%f in (*.7z) do (
        call :f_Repack "%%f"
    )
)

goto:EOF
:f_Repack
::Extract
%sevenz% e %1 -y -spf -o"%~n1"
::Make directories to ensure pp2.exe doesn't explode. Are there MAKE only mods?
mkdir "%~n1\AA2_PLAY"
mkdir "%~n1\AA2_MAKE"
::The hard part
pp2.exe "49_%~n1.pp2" ".*" "%~n1\AA2_PLAY" "%~n1\AA2_MAKE"
::Clean up
rmdir /S /Q "%~n1"
EXIT /B 0
goto:EOF