What about a combination between that double scooter and a snowplough?
Mind you, I've never seen manual wheelchairs in the same way since someone on BBC Ouch said they'd like to have blades/scythes sticking out of their wheels like Boudicca's chariot. When I used to use a white cane, I sometimes thought that Ambutec, which sells tips for their canes like golf ball tip, mushroom tip, roverwheel etc. should also do a sharp knife tip for their white canes for getting through crowds.
Oh dear, now I have a dreadful mental image. Where I am, we have a frustrating pavement parking problem. I think a lot of drivers do make an effort not to park too far across the pavement, but some are inconsiderate wotsits. What about a mobility scooter with a device that would shove cars off pavements and key access routes for people with mobility aids? I'd love to see a disabled person sailing down one of my local residential roads leaving a load of cars tipped on their sides in the road.