public function controllerActionLayoutLoadBefore(Varien_Event_Observer $observer)
{
    /** @var $layout Mage_Core_Model_Layout */
    $layout = $observer->getEvent()->getLayout();

    $layout->getUpdate()->addHandle('catalog_product_view_custom');
}

<catalog_product_view>
        <reference name="product.info.options.wrapper">
            <remove name="product.info.bundle.options" />
        </reference>
</catalog_product_view>

<catalog_product_view_whey>
        <reference name="product.info.options.wrapper">
            <block type="bundle/catalog_product_view_type_bundle" name="product.info.bundle.options" as="type_bundle_options" template="bundle/catalog/product/view/type/bundle/options.phtml">
                <action method="addRenderer"><type>select</type><block>bundle/catalog_product_view_type_bundle_option_select</block></action>
                <action method="addRenderer"><type>multi</type><block>bundle/catalog_product_view_type_bundle_option_multi</block></action>
                <action method="addRenderer"><type>radio</type><block>bundle/catalog_product_view_type_bundle_option_radio</block></action>
                <action method="addRenderer"><type>checkbox</type><block>bundle/catalog_product_view_type_bundle_option_checkbox</block></action>
            </block>
            <action method="insert"><block>product.info.bundle.options</block></action>
        </reference>
    </catalog_product_view_whey>