コマンドプロンプト起点(バッチファイル)で，PowerShellはアリ，PowerShellスクリプトファイル不可，サードパーティ不可という制約上でzip圧縮するには？

zip.bat

@echo off
REM どうすんだこれ;;

REM for /f "delims=" %%i in ( %~1 ) do (
REM     if "%%i" == "@echo off" (
REM         echo @echo on
REM     ) else (
REM         echo %%i
REM     )
REM )

echo.^
function New-Zip {^
  param([string]$zipfilename);^
  set-content $zipfilename (\"PK\" + [char]5 + [char]6 + (\"$([char]0)\" * 18));^
  (dir $zipfilename).IsReadOnly = $false;^
};^
function Add-Zip {^
  param([string]$zipfilename);^
  if(-not (test-path($zipfilename))) {^
    set-content $zipfilename (\"PK\" + [char]5 + [char]6 + (\"$([char]0)\" * 18));^
    (dir $zipfilename).IsReadOnly = $false;^
  }^
  $shellApplication = new-object -com shell.application;^
  $zipPackage = $shellApplication.NameSpace($zipfilename);^
  foreach($file in $input) {^
    $zipPackage.CopyHere($file.FullName);^
    Start-sleep -milliseconds 500;^
  }^
};^
new-zip test.zip;^
for /f "delims=" %%i in ('findstr .*') do @(
  powershell -Command "%%i"
)