Short of $10/gal. gas, the only way I see this being viable(profitable) is as part of a roller chassis. Sort of a generic frame and body kit, sold at various outlets, and a DIY your own power. Sort of like FactoryFive Kit car, where you build-or have built- a cool car using a scrap Mustang for parts. Instead of a scrapped Mustang, you buy the chassis and body kit and a wrecked or old bike to strip off the needed parts. All of the hard work is already done, but I still build it myself. The Ultimate Tourer...fuel economy, comfort, and space for luggage. Offer different options,ie.seating, or even something along the lines of Vetters Torpedo Scooter.
Defiant Scooter design