It's not like UND couldn't make a home and road jersey of the team the player was a part of with a commemorative patch on the shoulder. Have 15,000 made to be sold (each color) with the players name and number and commemorative patch on it. The money made could go to the player or a charity of their choice. Could even have the current team also wear that era jersey as a "one off" and auction them off, and the money could be used for NIL. Win, Win, Win, Win.
If the NCAA wanted to sue take them to court, they basically lose every case now a days.