[kh99]

That's pretty close. I think like this:

$templater = vB_Template::create('targhette');
    $templater->register_page_templates(); 
    $templater->register('my_var', $my_var);
    $templater->register('my_array', $my_array);
$targhette = $templater->render();  

vB_Template::preRegister('postbit_legacy', array('targhette' => $targhette));

and using hook postbit_display_complete, probably. For memberinfo you'd need another plugin (and change the template name in preRegister, of course). For that one use hook member_complete instead. Also, there is no $post for the memberinfo, but the user's info is in $userinfo, so you could just put $userinfo in place of $post in the register call. If you leave the name in the register call as 'post' then you can use the same template.

Edit: oh, I'm assuming that you know that the my_var and my_array register lines are just examples. If you use variables in your custom template, you'd want to replace those two lines with one or more lines to register your variables.