Wdeertz.....Find a friend with a welder. By the scooter rack and then just have them weld a square tube receiver onto it that will accept a bike rack.
You can buy the scooter rack, often at places like Pep Boys and even Harbor Freight. Harbor Freight sells all types of hitches and square tubing receivers. Buy the rack, figure out where you want the receiver mounted, stop by a hitch or muffler shop and have them weld it to the rack.
Heck, if you lived nearby, I would weld it for you. This is really a simple project.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab