A function for temporarily overriding the WordPress post context. For more info see https://philkurth.com.au/tips/a-function-for-temporarily-changing-the-wordpress-post-context/

override-wp-post-context-function-usage-example.php

<?php

/*
 * This is a rather simple and contrived example but it illustrates how this 
 * function can be used to temporarily change the post context.
 */
$alt_post_content = override_post_context( 1234, function ( $post ) {
	ob_start();

	// Do whatever you need here. The $post variable, in this scope, is the 
	// $post object we are currently working with.
	get_template_part('some/template');

	return ob_get_clean();
} );

override-wp-post-context-function.php

<?php

/**
 * Easy overriding of current post object for using template tags dynamically.
 * This is particularly useful if we need to use a template function that produces
 * side effects but doesn't have a complete 'get_xxx' equivalent; e.g; the_content();
 *
 * @param int|WP_Post $alternative_post The post ID or object for the new context.
 * @param Closure $callback A callback function that handles the calls to the
 * required template tags and returns output.
 *
 * @return mixed
 */
function override_post_context( $alternative_post, $callback ) {
	global $post;

	$post = get_post( $alternative_post );

	setup_postdata( $post );
	$return = call_user_func( $callback, $alternative_post );
	wp_reset_postdata();

	return $return;
}