It is certainly your vacation, with your choice on how to spend it, but I don't understand the thinking behind this. Even if you time everything just right once you arrive at DHS, and I'm guessing you are driving since you wind up the day there as well, once you leave DHS, it is about 15-20 over to Epcot via boat or walking. Then figure another 15-20 depending on wait times for the monorial to MK, same thing back to Epcot, and again back to DHS. So, 60 to 80 minutes of this day, not counting arrival and departure times at DHS from and back to your room seems like a lot of travel time. That is time we use either at the one park per day we go to, or resort and pool time, which, for us is way more important than travel time between multiple parks.
Again, your vacation and your time and if it makes you happy, then I am happy for you. It is just not sometime we have any desire to do.