You may try to add the code of the page.php file directly to searchKeyword.php. Just change this part:

require_once("./page.php");

to those:

$oPage = BxDolPage::getObjectInstanceByURI('', false, true);

if ($oPage) {

    $oPage->displayPage();

} else {

    $oTemplate = BxDolTemplate::getInstance();

    $oTemplate->displayPageNotFound();

}

Then before the  $oPage->displayPage(); add the parsing of the GET / POST argument about modules and keyword and then pass it to the template class. It will look like:

if ($oPage) {

    // your parsing code here

    $oTemplate = BxDolTemplate::getInstance();

    $oTemplate->setPageHeader(given new page header);

    $oPage->displayPage($oTemplate);

}