My concern would be adding the dry hops to a carbonated keg.. I would imagine it would foam right up... But maybe if you are fast you can close it back up first..
Buy a few growlers and go to a friends to watch football. If you took a growler every mon, sun and thurs you would be done with that thing fast. Start watching hockey and you'll need to make 10 gallon batches. You just need better beer/time management.
