Hello sonyplaystation -
unfortunately not - once the listing has gone over to eBay, the HTML for the template has gone with the listing and the new supersize functionality is template based.
You would need to either use Edit and Relist once the items close or are ended from the Closed Listings page (this will update a selected template where Bulk Relist would not), or you could post the listing again from your saved listings. Alternately you can get the HTML of the Saved Listing from the Saved Listings page and use that to update your already active listings.
- Craig