I think the DVLA will simply respond by saying the car will need to go through IVA if you modify the chassis. That will include the windscreen surround as its welded to the rest of the chassis and forms part of it to form the whole car.
You could challenge that by requesting all the information via a "freedom of information" request. You would then be sent bundles of paper work running to hundreds of pages, including loads of legal jargon. Good luck with that one !
I don't think Mazda will offer anything further other than to say, "don't do it" and they would just wash their hands of the idea.
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