Hey, if you're
really ambitious you can cut the squiggly thing off, remove the passenger footrest and slide the steering wheel over to the center of the kart--effectively making it a one-seater (move the gas pedal over too).
I've seen a few conversions from two-seater to one so it's not without merit or feasibility.
Two-seater karts must have been made as an afterthought and intended perhaps for well-meaning parents on a budget. However they're just not cool and having two kids or two teens on one kart no doubt made the fun quotient diminish. Having two adults riding certainly wasn't going to happen.
Well, it might happen slowly... and burn out the clutch.