Yes, a few quarter wave wires (about 0.46-m or 18-inches, your choice) will be a fine ground for the half wave, and fold/bend to fit.  Don't expect a huge improvement, though.

Washington is always updating its ferry system. They used to have a pretty good looking one in Olympia.  You could buy one, wait for high tide and take it to Elk City, or maybe Mapleton.  Folks could "live" on the upper decks, like a Coot Condo.    BE SURE to test the AIS range first!