Congratulations on finally running this to ground. How hard was it to run down this thread after all that time ?
I know of one situation where Topps created multiple copies of a baseball card to serve as a business card. In 1976 they created such cards for Joe Garagiola . The card pictured him as a catcher in the format of their 1973 card design. They then created more of them in 1991, updating the card with different business bio info. Both cards can be found with or without autos on ebay from time to time. I don't know how many were made but they are not rare, so Joe must have been liberal in giving them out with autographs on them.
The 1990 Topps President Bush card, while not a business card, is another example of Topps creating multiple copies of a single card for an individual.