possible - but keep in mind that you can't catch a bus from AK to EPCOT. The best option is to take a bus to Beach Club (or Boardwalk, Swan, Yatch Club), then walk over to EPCOT through the International Gateway. Another alternative is to jump on the bus to AK, CSR, or CBR and then stay at the bus stop until an EPCOT bus comes around.
Why not leave AK earlier? If you get there in the morning, you'll be done by 3 or 4pm. You can then go right over to EPCOT (or Boardwalk area) where there are many more place to eat.