Using gys-themed-categories but want the atahualpa header on top

Hi all, I'm using gys-themed-categories to give the theme "Recipes-Blog" (http://www.templatepanic.com/article...ordpress-theme) to all posts categorized as Recipes. However this theme has its own header. For a consistent look, I would like to keep my atahualpa header, but have themed pages for recipes.

Can anyone help me with this?

(I already tried replacing <?php get_header(); ?> in the Recipes-Blog index file with <?php include (MYSERVERPATHTOATAHUALPA/header.php'); ?> but of course this didn't work since atahualpa's header needs all the other files and functions in its theme directory. I'm wondering if I need to make my own custom version of atahualpa and incorporate the Recipe-Blog theme files but that is a little beyond my hack understanding of php