Use a bag with whole hops, then either santize a couple of marbles or some stainless heavy duty washers and put them in the bag with the hops and tie a piece of unscented dental floss to the bag, then tie the other end off on the handle of the keg. The keg will still seal up around the floss. and it makes it real easy to get the bag out. The weights keep the hops submerged in the beer the whole time.
"Yes, I am a pirate two hundred years too late. The cannons don't thunder there's nothin' to plunder,
I'm an [under] forty victim of fate, Arriving too late, arriving too late."