I don't know if I understand either. Are you not able to call print_standard_redirect(), or is it that you don't think it does what you want? Why not this:
Code:
function blockAccess($message) {
global $forbidbad, $badcookie, $myredir;
if ($forbidbad == true) {
writeCookie($badcookie, $message, $myredir);
}
global $vbulletin;
$vbulletin->url = $myredir;
print_standard_redirect('phrase_to_show');
}