RSS Feed - Feed for Post type "page"

Dear all,

my homepage has only pages so far. However, I would like to create a RSS feed. I understand that with wordpress this is not possible. Therefore I have inserted the following code through a snippet:

/**
********************
* CHANGES TS
********************
*
* Add RSS Feed for Pages
*/
add_action( 'pre_get_posts', 't5_pages_in_feed' );

/**
* Set post type to 'page' if it was requested.
*
* @param object $query
* @return void
*/
function t5_pages_in_feed( &$query )
{
if ( isset ( $_GET['post_type'] ) && $_GET['post_type'] === 'page' && is_feed() )
{
$query->set( 'post_type', 'page' );
$post_ids = array(8, 3, 2086);
$query->set('post__not_in', $post_ids);
}
}

Unfortunately, it still does not work. I have tried to reach the RSS via the following address:

https://asiaversum.de/feed/?post_type=page

Can you support me?

Many thanks in advance

STephan