Execute individual PowerShell v2 commands using .NET Framework CLR 4

CLR4PowerShell.psm1

function Invoke-CLR4PowerShellCommand {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory=$true)]
        [ScriptBlock]
        $ScriptBlock,
        
        [Parameter(ValueFromRemainingArguments=$true)]
        [Alias('Args')]
        [object[]]
        $ArgumentList
    )
    
    if ($PSVersionTable.CLRVersion.Major -eq 4) {
        Invoke-Command -ScriptBlock $ScriptBlock -ArgumentList $ArgumentList
        return
    }

    $RunActivationConfigPath = $Env:TEMP | Join-Path -ChildPath ([Guid]::NewGuid())
    New-Item -Path $RunActivationConfigPath -ItemType Container | Out-Null
@"
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0"/>
  </startup>
</configuration>
"@ | Set-Content -Path $RunActivationConfigPath\powershell.exe.activation_config -Encoding UTF8

    $EnvVarName = 'COMPLUS_ApplicationMigrationRuntimeActivationConfigPath'
    $EnvVarOld = [Environment]::GetEnvironmentVariable($EnvVarName)
    [Environment]::SetEnvironmentVariable($EnvVarName, $RunActivationConfigPath)

    try {
        & powershell.exe -inputformat text -command $ScriptBlock -args $ArgumentList
    } finally {
        [Environment]::SetEnvironmentVariable($EnvVarName, $EnvVarOld)
        $RunActivationConfigPath | Remove-Item -Recurse
    }

}

function Test-CLR4PowerShell {
    $ScriptBlock = { $PSVersionTable.CLRVersion }
    & $ScriptBlock 
    Invoke-CLR4PowerShellCommand -ScriptBlock $ScriptBlock 
    & $ScriptBlock 

    Invoke-CLR4PowerShellCommand -ScriptBlock { param ($name) "Hello $name" } -ArgumentList (Read-Host -Prompt 'Enter your name')
}

$ErrorActionPreference = 'Stop'
Set-StrictMode -Version Latest

#Test-CLR4PowerShell