The problem with just pulling in the full head is that it includes the page title as well as other meta tags that are set from within magento which you may not want on your wordpress pages.
What I did is added another block function to the plugin I called get_block_obj that rather than returning the block after calling the toHtml method just returned the actual block object so that I could do the following:
<?php echo get_block_obj("head")->getCssJsHtml(); ?>
Alternatively, you could just do the following:
<?php echo jck_mwi::layout()->getBlock('head')->getCssJsHtml() ?>
