Hmmmm, two days and you want to end at HS and Epcot? You say you have party tickets for MK so you have night covered there but you don't mention day there.
What I would do. On HS day go to AK in the morning, it tends to close down early anyway so you can more than likely get everything you want to do there in 1/2 to 3/4 of a day (I love AK and tend to spend parts of more than one day there during my trip). Maybe hit Nomad Lounge for a light lunch/drinks while you are at AK. That morning you can book your LL or Genie + for HS later in the day, heck you might even be able to get SDD if you hit it right at 7. Personally, if I were going for relaxed I'd skip the LL and Genie + and just do stand by, night time at HS will slow down some.
Do the morning at MK on your Epcot day, since you have a party there at night you can hit a few rides then so you could easily just do MK until 2 when you are eligible to hop. Then spend the afternoon/evening at Epcot. You should be able to hit a few rides in the afternoon, graze at the holiday booths in WS and see the night time show. All four parks are hit, you aren't really rushing through any of them since you are not worrying about hitting all the "must dos" and are aiming for a relaxing trip.