A regular funnel is a pain. I didn't know canning funnels existed so I took apart an old Brita water filter. The inside of the Brita is a white plastic cylindrical piece,and the top has a large opening normally where you would poor water. It fits onto the carboy ok.
Just jerry rig a funnel out of anything and slide the whole leaf hops on into the carboys. I don't see the point about racking to secondary just to dry hop. Unless you rack your beer in a sealed off CO2 / nitrogen environment, you're likely doing more harm through oxidation than gaining anything by getting the beer off the trub. I dry hop in primary now and I've noticed a difference FWIW.