I've read all the various posts and think the word repro is a problem and the product needs to be tweeked.
I am pretty sure that most any hobbiest would agree that only easily identifible re-creations should be offered. I feel in two forms thus:
First clearly printed or watermarked on the front Copy of Factory Broadcast Sheet, or Created Broadcast Sheet.

The Created Sheets *could* be offered to those cars with incomplete or lacking sheets, if a vin, fender tag, invoice, and/or punch card(?) could be used to validate the represented car.
I can see all kinds of problems arising from accurate reproductions being modified, copied and claimed to be a copy of the "lost original".
Any repro or recreation needs to have tell tale markings and hidden features to be easily identifed as non-original.