What a s£$%^ position to be in, feel for you.
You are right your phone call was reading a script, but I guess the guy tried to be "human" but his companies legal advisors have clearly got to the letter and what happens.
My opinion in these types of matters is that it is unlikely that a win really exists for the customer as the item is "used" and was bought as such, usually as you've found the small print is extensive in who it protects (not the customer).
At some point I fear you are unfortunately going to have to negotiate a deal with them for full and complete settlement. The question I think you'll have is what is fair to you and what this dealer will accept. They must know that the forums reach a sizeable percentage of buyers and service buyers but not enough to put them off, that said in other areas determiend customers have had success in using forums and other sites to gain some bargaining ground with a seller / company, a very awkward route to go down.
Not sure what I'd do in your shoes but knowing you like the car it seems one alternative is to swap it for something else they have in their group that is similar, the only way is to talk with someone really senior who has all the say, that way they keep your money and you get a Zed you are happy with, I suspect they'll have you sign some form of waiver to complete this. They will of course be able to shift the Zed on elsewhere when they have rectified the points they feel are needed to do so.
Another alternative is to hold on and be tough but the guy is probably right sadly in saying it is unlikely you'll win and the "value" of swap/ trade slips overtime and plus you have the hassle / stress in the meantime.
As said, feel terrible for you but am trying to be a realist to help you get a speedy and as close to fair settlement that you can. All this is IMO and suspect others may not agree but please take the comments as intended in good faith.
Best of luck !!!!