Subdomain homepage cannot be found

After being hacked and a few of my php scripts being redirected to a site not affiliated with me, I’ve got my site *mostly* working

I’m running a WordPress site in my subdomain (http://subdomain.example.com) in my public_HTML/gallery folder with the WordPress folder called wp

As I’m dependant on a plugin to create image thumbnails to permalinked pages, I can’t do anything too radical

At the moment I’m using .htaccess and index.php to create prettier permalinks, and although the permalinks to the individual pages work, I cannot get a static homepage to be displayed without “Not Found
It looks like nothing was found at this location. Maybe try a search?” being displayed

This is the contents of my .htaccess file

RewriteOptions inherit

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /wp/index.php [L]
RewriteCond %{HTTP_HOST} ^(www.)?gallery.hamratimageworx.co.za$
RewriteRule ^(/)?$ wp [L]
</IfModule>

# END WordPress

My index.php file

<?php
/**
 * Front to the WordPress application. This file doesn't do anything, but loads
 * wp-blog-header.php which does and tells WordPress to load the theme.
 *
 * @package WordPress
 */

/**
 * Tells WordPress to load the WordPress theme and output it.
 *
 * @var bool
 */
define('WP_USE_THEMES', true);

/** Loads the WordPress Environment and Template */
require( dirname( __FILE__ ) . '/wp/wp-blog-header.php' );

I’ll admit that I’m not too clued up on this sort of thing, so any help would be appreciated