3 days in MK is too much in my opinion. I cast another vote for 2MK 2EP 1HS and 1AK. Epcot is so enjoyable just to take in the beauty of it and if always feels less crowded than other parks because it is so spread out. Don’t judge it by the number of attractions. My kids will happily spend hours in the maze in england, looping the three caballeros boat ride in mexico, sitting down and watching performers, eating gelato in italy.
But if you don’t want 2 days in epcot get a water park ticket instead of 3 days in MK.