I will explain my problem a little more.

I have a dynamic php page which I am linking to my custom WordPress (page name is ‘deltown’) page. Within this url I am passing two variables so that my ‘deltown’ page can get values from a table in the database.

Currently my url from the .php page to my wordpress ‘deltown’ page is:
example.com/deltown/value1/value2.html

In my template functions.php page I have added this set of functions to redirect to the ‘deltown’ page from my php page:

function custom_rewrite_tag() {
	add_rewrite_tag('%cid%', '([^&]+)');
	add_rewrite_tag('%town%', '([^&]+)');
}
add_action('init', 'custom_rewrite_tag', 10, 0);
				
function custom_rewrite_rule() {
	add_rewrite_rule('^deltown/([^/]*)/([^/]*)/?','index.php?page_id=3090&cid=$matches[1]&town=$matches[2]','top');
}
add_action('init', 'custom_rewrite_rule', 10, 0);

My permalink for the custom page is:
example.com/deltown
and I have no page title set.

In my .htaccess file I have this:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^deltown/(.*) /$1.html [R=301,L]
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

I have tried this line RewriteRule ^deltown/(.*) /$1.html [R=302,L] both inside my WordPress block and at the top of the file, outside the Worpress block. This works and produces a url of example.com/value1/value2.html but takes me to a ‘page not found’ page. How can I get the rewritten url to my custom page without ‘deltown’ in the url? Can this even be done?

The reason why I need the url this way is because we are moving our website from Prestashop over to WordPress/Woocommcerce and we have a few thousand indexed pages in google and don’t want to loose them. If I can get this url to write as I need then the move across platform should be a lot easier