what i usually do is put the hops in a muslin bag, tie a length of (unflavored) dental floss around the knot in the bag, and then tie that off to one of the handles on the keg. then close her up...the floss is so thin it won't mess up the seal and then you can take the hops out when/if you want.
i've done this after deciding that a beer was not hoppy enough, that had already been on tap, a couple of times...you're beer will be fine and it will work great.