No not if you are planning to take advantage of the on-site 30 minute Early Entry (EE). I am not sure that you want to walk all the way to Pixar just to unlock Tiers and Multi Park LLMP selections.
I would just hit Remy as you enter from the IG gate. You should already have a Frozen LLMP for your 7 day advanced pre booked LLMP selections. Remy is easy to hit via the Standby Queue first thing after entering Epcot.
Yes you can only book for normal Park Hours. The LLMP and/or LLSP selection options start right at park opening (normal hours). But your first LLMP and/or LLSP time offered may be at 10/20/30 minutes after the hour. Do you need them that early no but why not always have 3 selected and use your first one to unlock Tiers and Multi Park LLMP selections.
You book LLMP and/or LLSP by the day so just book for your travel party for the days they will be with you at the Parks. No need to close out and start new. Just have both your Payment Methods already setup in
MDE under your Account before you start booking your first day of LLMP and/or LLSP selections.
For each day you chose your Travel Party that you want to include in your pre-purchased LLMP and/LLSP selections and then pay for each day one at a time. Does that make sense to you?
Dave