OK, so you're saying you want a plugin that will insert it automatically, so you can release a product and not have to have any template editing instructions? OK, you could try this: use hook process_templates_complete and code like (just showingthe last few lines):
Code:
$templater = vB_Template::create('teck_brb_temp');
$templater->register('teck_brb_temp', $teck_brb_temp);
$templater->register('teck_brb', $teck_brb);
$header = $templater->render() . $header;
But I think that hook was recently added, in vb4.1.10 or so, so it might not work in older versions. For versions before that you might need to do a replacement on $vbulletin->templatecache['header'] which is a little complicated. Here's a post showing an example of one way to do it:
https://vborg.vbsupport.ru/showpost....&postcount=211