MK in the AM - get out by 11 AM - do lunch at a nearby resort - Whispering Canyon, GF Cafe, Kona Cafe. If it's an early morning - you'll get a bonus hour to play on the rides.
Do AKL or EPCOT after, on a Sunday afternoon.
EPCOT may be easier - if you eat at a monorail resort for lunch.
Other option - do a 11:30 AM lunch ADR for CP or Cindy's.
2nd option - do MK in the AM and go to the resort pool or mini-golf in the afternoon (depending on weather) - if raining - try DTD and browse the shops.
We've done MK on a Sunday AM on Memorial Day weekend, and in late June
no problem first thing and out at 11 AM when the crowds pour in.