humm, not so easy but try to copy also the swift-framework.php and inside the functions.php add this code
if ( ! function_exists( 'sf_include_framework' ) ) {
function sf_include_framework() {
require_once( get_stylesheet_directory() . '/includes/swift-framework/swift-framework.php' );
}
add_action( 'init', 'sf_include_framework', 0 );
}
Inside the swift-framework.php of the child theme change the include directory of the page builder
/* SWIFT PAGE BUILDER
================================================== */
include_once(get_stylesheet_directory() . '/includes/swift-framework/page-builder/sf-page-builder.php');
Give it a try.
-Rui