Of course, plenty of companies licensed the right to show player pictures in the past without getting MLB permission to show uniforms. This Nestle card's one example.
1988 Nestle #5, Ozzie Smith
While a great close-up of Ozzie Smith, Nestle calls the team "Cardinals" and airbrushed everything to solid red, as if The Wizard actually plays for a weekend softball team.
Upper Deck could've gone this route (by photo-editing each card) and clearly chose not to do so. I doubt that a 700-card set of bland pictures would sell well, so wonder--did they have much of an alternative?