You can do extra weeks, if you have a long history of training, I would decide if you think you need more max strength or more ME. If you don’t have a long history, I’d probably do a longer transition period. You can also do a combo of these things.
The one thing to keep in mind is that is a 24 week program. The end of July is 14 weeks away. Do you really want to be locked into a program for 38 weeks? Thats a long time for fully structured workouts. Maybe take some time to play before your program starts? You can still play for 10 weeks and add 4 weeks of additional training to supplement things you feel you need extra on.