Yup! I'm pretty sure we'll run into each other!
I agree that you should head to Soarin first when you enter the park and if you can make it to ropedrop then even better. Should be able to ride stand-by without much wait if you're there at RD. Or if the standby wait time is a bit long (which could be longer than average since TT will be closed), then grab FP, hop over to The Seas, then come back to Soarin at your FP time. And yes, opening time is 9am although based on posts on DIS and Josh from easywdw, it sounds like Epcot may also be opening the turnstiles earlier than the park opening times. We have an 8:05am ADR at Akershus breakfast, and plan is to hit Soarin first at 9am.
And as far as going back to Poly before BB, you had me at Kona Coffee!!

Can't argue with that! If you do decide to try to go from Epcot to BB, there are lockers available near Spaceship Earth and at International Gateway.
So exciting, isn't it? 83 days and counting!