Hi Alex,
Is your K2 item always loaded in the category page or doesn't appear sometimes due to the navigation parameters.
If it's always loaded, you could add some JS script that moves your item content to the top.
The other problem is that the items are split in different arrays before the K2 template file is called : an array for the primary section, another for the secondary, etc. If you move one item to another place, you will certainly have layout & css problems.
Olivier