Well hate to disappoint you but a hitch/receiver is not going to be an option.Hitch / receiver would be my #1 option, so I can have a good/accessible bike rack.
EM (Elio Motors) has stated that towing anything will void the warranty; so even if you only plan on using it for a bike mount the hitch option won't be on the list; however, they have talked about creating a bike rack for the Elio.