The last post seems about right to me. Try training 2 positions max & just move as many players into those two positions for training as possible, they need 5 mins at least to recieve any training, & 48 mins is the max, I'm sure you already new that part.
I f you are out of the cup play your two league games as you would, then for the scrimmage play everybody out of position so you can get big minutes on guys who otherwise would have recieved no training at all. No one cares about scrimmages with regards to Wins & Losses, just training minutes.
Right is not a popularity contest!