(Wordpress) Embed posts in an HTML-template using a shortcode

functions.php

// [embedpost id="#"]
function embedpost_func( $atts ) {

	$a = shortcode_atts( array(
		'id' => 'Please add an "id" attribute',
	), $atts );

	// The post that is queried
	$query             = get_post($a['id']);

	// Collect data from WP_POST
	$type     = $query->post_type;
	$id       = $query->post_name;
	$name     = $query->post_title;
	$content  = $query->post_content;

	// Collect data from Types plugin
	$custom		= get_post_meta( $a['id'], 'wpcf-my_custom_field' );

	ob_start();
	include get_template_directory() . '/my-output-template.php';
	return ob_get_clean();
}
add_shortcode( 'embedpost', 'embedpost_func' );