Don’t get stuck in the idea the dealership has to be the same brand as your car.
Contact motability when you have and issue and see if they offer an alternative based on your needs .
When my last car needed adblu the VW dealer is 20 miles away but I was able to go to the local Hyundai dealer for the top up.
Same with general servicing. There is no rules that say you have to go to the same brand dealer to maintain your service history as long as standards are met. See if motability would let you go elsewhere.