[Plugin: WP Super Cache] external use?

Is there any way to use supercache for an external page without loading the entire wordpress backend?

I’ve quite a few pages that use the same blog design (header,footer, css) for php scripts that I’ve written. They’re all using a custom header and footer file so I’m at the point where I’d like to further reduce server load by just using the template and supercache..

currently my sites have:
require(‘../wp-blog-header.php’);
$iswpress = “no”; // so I set the page title and other non-wp elements in header. although not necessary now.
include ($wpthemeheader); // adds the actual header.

I am assuming that require(‘../wp-blog-header.php’); loads the entire wp backend, but what if I just want supercache for a page instead of everything? (for these external scripts)
What could I include and what function (&options) would I call? Thanks