Fans take this game far to serious. ANY matchup with anybody other than the practice squad would result in a full blown game. Coaches don't want to lose even under the OP's terms, that is playing scrubs. The press would cover it. Highlights on ESPN .. Kessling would show up (He's there for the O&W isn't he?). No way you could put on a half a$$ UT vs. anybody game.
One caveat.. Back when I was in school, there were Freshman games. Freshman couldn't play varsity and they drew a couple of thousand. I remember walking to class on the hill on a friday afternoon and seeing a football game going on (Freshman). You could see the field from the hill then. Just listened to the "HOST OF VOLUNTEERS" podcast. Bill Battle and Condredge talking about news leaking about this great freshman black QB. UT played Notre Dame (Freshman game) and 30K or so people showed up to watch and Condredge lit it up that day.
That's a different era.. Can't do it today.