When working with associates at sub varsity games on this I will change the dead ball false start to a live ball illegal shift and let the defense have their choice. I will then spend the majority of the ride home having them repeat dead ball fouls to me
Fortunately I don't R varsity yet, but if I did and both my HL and LJ saw a false start and didn't blow their whistles, they would be buying pizza and beer for the meetings for a month but I would do it properly and tell the coach we made a mistake letting the play go and give the defense the dead ball penalty option.