What a fun idea! I would definitely utilize EMH. Do you want to try and maximize the number of rides you see in each park or just say that you did it? I wonder if you could effectively rope drop two parks in one day? Perhaps Studios and EPCOT since you can walk between them and don't have to rely on a bus. For instance, rope drop Studios and ride TSMM, walk to EPCOT (about 30 minutes) and rope drop Soarin then ride TT using single rider line. Do some other rides in Future World and then get an early lunch World Showcase before heading back to Studios. (If you luck out with the boat being at the dock when you are walking in either direction, take the boat instead to rest your feet). Ride ToT and RnRC and Star Tours using FP. Take a bus to AK. See what FPs are available and maybe ride Everest with single rider. Go to Festival of the Lion King. Currently, this park tends to empty out early so you might luck out arriving late afternoon. Take bus from AK to MK. Have dinner ADR at BoG. See what FPs are available. Stay late and see if the crowds thin out. This sounds like a fun challenge. I might want to try it.