For under 25 year olds you are really asking a lot there, but how about the Skoda Karoq 1.6TDi SE automatic or Jeep Renegade 1.6 Longitude although I am not sure of the onboard kit. The jeep will certainly have enough headroom if you can climb in.
Personally, I would say sod the ‘street cred’ and if the Ford Tourneo Connect etc fitted the bill then that would be the car of choice.
If discarding the ‘under 25’s’ requirement then it does open up a lot more vehicles.
As for demo cars parked in the disabled parking spots, take a few pictures of them in situ and send them to the CEO of the dealership group, saying you would have bought a car from them but………………..! Then add you are thinking of posting the photos on social media and sending them to the press! It often has the desired result – I got two bottles of Fortnum & Mason Champagne and some of their flowers for the missus sent by a dealer group CEO after I e-mailed him the photos of his stock parked in the disabled bays!
Dave