Simply create a template override for page_head.tpl for the frontpage only. I've done the same.
in your override.ini of your siteaccess add something like this, where match node is the node id of the frontpage:
[front_page_head]
Source=page_head.tpl
MatchFile=front_page_head.tpl
Subdir=templates Match[node]=2
Copy the page_head.tpl from the standard templates to your site design /override/templates/ and rename it to the matchfile, in this case front_page_head.tpl. Edit the template to your likings, save, clear the cache and you're all set.