Yes. You can get into MK probably around 7:45am with your ADR. Go to Crystal Palace and check-in and they should seat you pretty promptly. It's a buffet so you can eat as swiftly as you would like. Your only hold up will be if you want to see the characters during breakfast. Pooh, Piglet, Tigger and Eeyore all will make the rounds for pictures and such, and if the restaurant is busy it can take as long as an hour or more for them to all get to you. Just keep an eye on the time, and you can leave the CP and get to one of the inner ropes within the park itself and wait for a CM to grant you access to Fantasyland. (This will be right around (9AM.) Then you can head to Fairytale Hall and get in the Standby line to see A & E. (Though be prepared to still have to wait because there will be individuls with FP+ to see them at 9AM and usually FP+ guests take precedence to standby.)