New-ProxyFunction.ps1

using namespace System.Management.Automation

class ValidCommandsGenerator : IValidateSetValuesGenerator {
    [string[]] GetValidValues() {
        $Values = (Get-Command).Name
        return $Values
    }
}

Function New-ProxyFunction {
    [CmdletBinding()]
    param (
        [parameter(mandatory)]
        [string]$Name,
        
        [parameter(mandatory)]
        [ValidateSet([ValidCommandsGenerator])]
        [string]$TargetFunctionName
    )
    Process {
        $TargetFunction = Get-Command $TargetFunctionName
        $TargetFunctionMetadata = [System.Management.Automation.CommandMetadata]::new($TargetFunction)
        
        $ProxyFunctionBody = [System.Management.Automation.ProxyCommand]::Create($TargetFunctionMetadata)
        $ProxyFunction = "function $Name {`n$ProxyFunctionBody`n}"
        $ProxyFunction
    }
}