Replacing the private functionality of loaded module

gistfile1.ps1

$module = New-Module -Name "monkey" -ScriptBlock {
  function Get-Stuff {
    return GetStuffPrivate
  }
  function GetStuffPrivate {
    5
  }
  Export-ModuleMember Get-Stuff
}
Import-Module $module # you can also just use $module = Get-Module "someName"
Get-Stuff # returns 5
# DoStuffPrivate # this is private, can't call it
. $module {function GetStuffPrivate { "tehehe" }}
Get-Stuff # returns "tehehe"

Remove-Module [m]onkey