I made up a pair of vinyl-coated cables with loops at both ends, so I can lock up his and hers. One end fits over the front luggage rack bolt/bushing. They swing out left/right for use, swing inside/under the rack plate when not in use. Slick, light and out of the way. Works with the Gobis too. Seat stays in place. I use small brass bodied locks on the end loops to the helmets.
You can usually make up stuff like this at a marine supply store back in the rope/cable/rigging section. Cost like 3 bux.
"Hells AL is right."Zuber "Bad roads, good people. Good roads, bad people." Mama Espinoza
“Ride first, tart second. Sorry bro but that’s the way it has to be.” Cbrit, 2008
“You gas it where I brake!” trackday passenger, Thunderhill, 2005 "Especially since he's one of the fastest riders on the planet, on any surface!" Earwig, 2014