I ran into the same problem. I really didn't want to take the time and drop 15 players for every team (I'm lazy haha) but at the same time I like things to be accurate.
Basically, the easiest way to do it is sim until the last day of spring training. I turned injuries off for simming ST, then after I turned injuries back on. Go through each team and send down 15 players to AAA. I went on MLBdepthcharts.com and went through each team. Whoever wasn't on the MLB roster, I sent to AAA. It took no longer then 2 hours and everything looks great. However, I only did this for the AL. After I finished the AL, I ended spring training and went to the NL and just fixed up the lineups/rotations, once again using MLBdepthcharts.com. The NL took about a half hour.
Try doing it by each division. Do the East, take a break, then Central, take a break, etc. so it doesn't seem overwhelming.

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