我会这样做：

Write-host "Trusting PS Gallery"
Set-PSRepository -Name 'PSGallery' -InstallationPolicy Trusted -ErrorAction Stop

Write-Host "Installing PolicyFileEditor"
Install-Module -Name PolicyFileEditor -Scope CurrentUser -ErrorAction Stop

Write-Host "Installing MyGlue Chrome Extension Add-On (set LGPO)"
$MachineDir = "$env:windir\system32\GroupPolicy\Machine\registry.pol"
$RegPath = 'SOFTWARE\Policies\Google\Chrome\ExtensionInstallForcelist'
$RegData = 'bfcdaalpeodhimbiipneeaoeogkkminc;https://clients2.google.com/service/update2/crx'
$RegName = '1'
$RegType = 'ExpandString'
Set-PolicyFileEntry -Path $MachineDir -Key $RegPath -ValueName $RegName -Data $RegData -Type $RegType -ErrorAction Stop

Write-Host  "Updating LGPO w/o restart"
echo N | gpupdate.exe /target:Computer /force

但请确保值名称"1"不存在于其他加载项中，否则它将被覆盖。
你可以这样解决它：

$RegName = '1'
if ((Get-ItemProperty "HKLM:$RegPath").PSObject.Properties.Name -contains $RegName) { $RegName = '2' }
if ((Get-ItemProperty "HKLM:$RegPath").PSObject.Properties.Name -contains $RegName) { $RegName = '3' }
if ((Get-ItemProperty "HKLM:$RegPath").PSObject.Properties.Name -contains $RegName) { $RegName = '4' }

但这并不好，也许还有更好的解决办法：例如，使用RegEx或循环，其检查值名称并将下一个空闲的可用数字作为名称。
比如：$RegName = "Take the next available (not existing) number as name (string)"