Won't the time change/jet lag work to your favor in terms of an early morning? Like, 10am for you would be 8am here?
The early morning hours are the absolute best hours of the day, and Sunday would be your only day to enter a non-MM
Disneyland, so rope drop on Sunday would be your best time to hit Fantasyland.
If you're not going to get to the parks until noon, Sunday vs. Monday may not really matter...