Como manipular e limpar a saída de -WhatIf no PowerShell?

Estou tentando capturar e limpar a saída do -WhatIfparâmetro no powershell para uma operação de renomeação de arquivo. O objetivo é remover algumas partes da saída, mas mesmo depois de várias tentativas, não consegui fazer funcionar. Abaixo estão os métodos que tentei:

Set-Location "C:\Path\To\Directory"

$Replace1  = 'Item: C:\Path\To\Directory\'
$Replace2  = 'What if: Performing the operation `"Rename File`" on target'
$Replace3  = 'Destination: C:\Path\To\Directory\'
$VarIvExp  = "GCI -Path . -Filter *.pdf | Ren -New { `$_.Name -replace ' ', '_' -replace '-', '_' } -Whatif ;"

# Various attempts to capture and replace parts of the output:
Invoke-Expression $VarIvExp            | % { ($_ 3>&1).Replace($Replace1,'').Replace($Replace2,'').Replace($Replace3,'') }
Invoke-Expression $VarIvExp.ToString() | % { ($_ 3>&1).Replace($Replace1,'').Replace($Replace2,'').Replace($Replace3,'') }

Invoke-Expression $VarIvExp 3>&1       | % {  $_.ToString().Replace($Replace1,'').Replace($Replace2,'').Replace($Replace3,'')       }
Invoke-Expression $VarIvExp.ToString() | % { ($_.ToString() 3>&1).Replace($Replace1,'').Replace($Replace2,'').Replace($Replace3,'') }

Invoke-Expression $VarIvExp.ToString() | % {  $_            | out-string -Replace $Replace1,'' -Replace $Replace2,'' -Replace $Replace3,'' }
Invoke-Expression $VarIvExp            | % {  $_.ToString() |            -Replace $Replace1,'' -Replace $Replace2,'' -Replace $Replace3,'' }

Invoke-Expression $VarIvExp 3>&1       | % {  $_            | out-string -Replace $Replace1,'' -Replace $Replace2,'' -Replace $Replace3,'' }
Invoke-Expression $VarIvExp.ToString() | % {  $_            |            -Replace $Replace1,'' -Replace $Replace2,'' -Replace $Replace3,'' }
Invoke-Expression $VarIvExp            | % {  $_.ToString() |            -Replace $Replace1,'' -Replace $Replace2,'' -Replace $Replace3,'' }

• Saídas:

What if: Performing the operation "Rename File" on target "Item: C:\Path\To\Directory\SomeText  I nº 001-SMSCBMRJ-20250222.pdf" Destination: C:\Path\To\Directory\SomeText__I_nº_001_SMSCBMRJ_20250222.pdf
What if: Performing the operation "Rename File" on target "Item: C:\Path\To\Directory\SomeText  I nº 002-SMSCBMRJ-20250222.pdf" Destination: C:\Path\To\Directory\SomeText__I_nº_002_SMSCBMRJ_20250222.pdf
What if: Performing the operation "Rename File" on target "Item: C:\Path\To\Directory\SomeText II nº 001-SMSCBMRJ-20250222.pdf" Destination: C:\Path\To\Directory\SomeText_II_nº_001_SMSCBMRJ_20250222.pdf
What if: Performing the operation "Rename File" on target "Item: C:\Path\To\Directory\SomeText II nº 002-SMSCBMRJ-20250222.pdf" Destination: C:\Path\To\Directory\SomeText_II_nº_002_SMSCBMRJ_20250222.pdf

Nota .: Também tentei várias manipulações diretamente em $Results, mas sem sucesso. Abaixo estão as tentativas com $Results...$Results.Replace('various attempts','')

Set-Location "C:\Path\To\Directory"
$Replace1  = 'Item: C:\Path\To\Directory\'
$Replace2  = 'What if: Performing the operation `"Rename File`" on target'
$Replace3  = 'Destination: C:\Path\To\Directory\'

$VarIvExp  = "GCI -Path . -Filter *.pdf | Ren -New { `$_.Name -replace ' ', '_' -replace '-', '_' } -Whatif ;"

$Results = Invoke-Expression $VarIvExp

$Results = Invoke-Expression $VarIvExp.Replace( -Replace $Replace1,'' -Replace $Replace2,'' -Replace $Replace3,'')

$Results.ToString().Replace($Replace1,'').Replace($Replace2,'').Replace($Replace3,'')

• Resultado desejado/esperado:

SomeText  I nº 001-SMSCBMRJ-20250222.pdf SomeText__I_nº_001_SMSCBMRJ_20250222.pdf
SomeText  I nº 002-SMSCBMRJ-20250222.pdf SomeText__I_nº_002_SMSCBMRJ_20250222.pdf
SomeText II nº 001-SMSCBMRJ-20250222.pdf SomeText_II_nº_001_SMSCBMRJ_20250222.pdf
SomeText II nº 002-SMSCBMRJ-20250222.pdf SomeText_II_nº_002_SMSCBMRJ_20250222.pdf