[Zachery]

The board offline messages are directly injected into the header/footer, around line 540 of includes/class_bootstrap.php

PHP Code:

  if (!$vbulletin->options['bbactive'] AND
   ($vbulletin->userinfo['permissions']['adminpermissions'] & $vbulletin->bf_ugp_adminpermissions['cancontrolpanel']))
  {
   // show the board disabled warning message so that admins don't leave the board turned off by accident
   $warning = vB_Template::create('board_inactive_warning')->render();
   $header = $warning . $header;
   $footer .= $warning;
  } 


You might be able to get tricky and change:

PHP Code:

 $header = $warning . $header; 


to

PHP Code:

  $navbar .= $warning;