While I agree in general premise with these ideas, there are a lot of logistical hurdles for inking these sorts of NIL deals. In reality, there are only a handful of bowls that are meaningful in any way, that this would even make sense from both sides. Once the playoff gets expanded, I only see those games, or NY6 equivalent games being justifiable for these sorts of NIL deals (due to extra wear and tear of additional games), which would likely come from sponsors of bowls for non-playoff games.
The reality is that lower-tier bowls would simply not be justifiable to have these sorts of NIL deals, as getting an NFL caliber player to play in Detroit, for example, would not move the needle for people to watch the game in person or on the tv set. The fact of the matter is that the shear volume of bowl games has diluted the value of a majority of the bowls, which also makes these sorts of NIL deals infeasible. I also do not think people attend most bowl games for watching specific players, but rather go for the experience.