Up to yourself of course, but you'd have certain grounds for an appeal I'd suspect (between VRT & NOx) if they've gone with the highest NOx & VRT (41%) rates.
You've nothing to lose (except a bit of time & a lot of patience) essentially - I know of a few appeals that have been quite successful once official paperwork has been presented backing up the ground for appeal.
Have a friend working for a BMW dealership. I have asked of he could track down a cert of conformity with the VIN so we will see how it goes. No harm in trying as you say.
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Racing is Life anything that happens before or after is just waiting~ Steve McQueen