Technically, the mailsail does not have to be changed for a loose-footed setup. An S-hook between the stock gooseneck and a short harken traveler with S-hook for the outhaul would be the way I would do it.

The Hobie 16 is a great beach cat, don't get me wrong. I really don't like self-tacking jibs and think large foresails are for distance races or large course racing. The "regatta" is not changing with the times and boats. When there is a boat change, the course should change too.