If the vehicle is no longer suitable, Motability are usually pretty good about early changes, on top of which I’m sure I’ve seen exemptions to the rules for Disabled badge holders left, right and centre. On top of that, I wouldn’t be too surprised if the restrictions slowed down as the country reacts and adapts to non-EU membership so less rules forced on us too, although I know the UK govt may well implement similar rules
"Man is born in freedom, but he soon becomes a slave, in cages of convention, from the cradle, to the grave."