Didn’t Kia and Motability announce a few weeks ago that the new PV5 Passenger would be available on the scheme soon? That’s absolutely massive but it has a modular seating system.
The only current smaller scheme car that I can think of on the scheme where all seats fold flat and has good entry and exit is the Hyundai Inster and Inster Cross. The Jazz Crosstar used to be good for that sort of thing but that’s no longer available on the scheme anymore.