You have to draft with that in mind. Get enough PA without your scrubs. Have 0 bench players, just your starters. All scrubs need to be lowest PA you can find. Start them the first 8-10 games (at the top of the lineup to maximize PA) to get them full seasons PA right up front. Once they hit, set rest to 99 and remove all of them from the hierarchy. Set PH settings to aggressive or very aggressive, double-switch on, and then when season starts send two scrubs to AAA for the pitchers. Sparky’s only option is Caruthers, but even the. He won’t always PH with him. There will still be times he’ll let the pitcher bat instead. However, about half the time, sparky will swap him in on a double switch and leave in the OF and he can pick up an extra AB or two.
More consistent way to get pitchers in is to keep playing a lineup of 0% fatigue hitters who get injured and replaced by the pitchers in the field (pitcher has to have fielding rating at position).