How to make friends with old legacy codes with symfony?

Question

symfony

The project does not understand what old *.php files respond to some routes, they do it even there and render the answer in their template engine
, is it possible to call the controller somehow from them?
there is something like

$tpl = Template::factory();

$tpl->setVariable( 'module', $Module );
$tpl->setVariable( 'account_activated', $accountActivated );
$tpl->setVariable( 'already_active', $alreadyActive );
$tpl->setVariable( 'is_pending' , $isPending );

?>

do I need to do something like
call_user_func("MyController", ["module"=>$Module, "account_activated"=>$accountActivated] from the end of the file so
that the controller will work further and I could pull some service inside and further render the response to twig?
or
as far as I know, the kernel is available through a global variable
, you can access the kernel directly
, but it is necessary that the execution of the php file be interrupted and control transferred to the controller