Make the simple things difficult

Would it really be so hard to show how to replace one SID with another in a file ACL?

  $acl = get-acl thefile
  $sddl_orig = $acl.sddl
  $new_sddl = $sddl_orig -replace 'S-1-oldsid' 'S-1-newsid'
  $acl.SetSecurityDescriptorSddlForm($new_sddl)
  $acl | set-acl

Yes, this can be condensed to a single line, but as far as I can google, nobody has it:

  gci | get-acl | foreach { $_.setsecuritydescriptorsddlform($_.sddl.replace('S-1-oldsid','S-1-newsid'))} | set-acl