These scenarios are hard to offer constructive criticism for and against. A lot of how you handle this depends on how the car was ordered. Was DAP an included part of the car you ordered or did you pay extra for it because it offers something that benefits the particular disability at hand?
But in the here and now, the equation is simply whether DAP is important to you. You have two choices – take car that’s available now OR stick to your guns and wait for what you ordered. Only you can really weigh up the choices and whether the offer from the dealer is reasonable restitution for not delivering the car you ordered. Personally, I’d tell the dealer to foxtrot oscar but that’s just me.