I'm not sure if I understand what you're asking, but if you inserted {vb:raw test_autotemp} in your footer and you want another template to appear there, then you could create a plugin using hook parse_templates and code like:
PHP Code:
$templater = vB_Template::create('template_name');
$templater->register('my_var1', $my_var);
$templater->register('my_var2', $my_var2);
$autotemp = $templater->render();
vB_Template::preRegister('footer', array('test_autotemp' => $autotemp));
Of course this is just an example. You'd need to change the template name and registered variables (if any).