Back when I ordered a VW Golf on a 64 plate I spoke to the dealer the week before my order date started and said to them I was adding three options at a cost of about £400.
The day before the appointment at the dealership to order the car Motability added the Golf Match to their AP price list at the same AP as the lesser model and the dealers face told a story when I said forget the trim I was going to order and go for the Match. It wasn’t all bad news for the dealer though because I added a forth option with the money I saved not paying for the other options. ☺️
So I too say” keep an eye on the dealer” and Motability AP’s.