Belle and Aurora both meet in France at alternating times, so you can hop from one line to the other.
This is what I posted in my trip report: “I headed back to France to meet Belle and Aurora. Aurora was finishing up when I arrived, so I jumped in the line for Belle (maybe the 10th family?) Belle was coming out in 5 minutes, and t took about 20 minutes total to meet her. That meant Aurora was coming back in 15 minutes, so I went straight to her line and was 2nd to meet her. (So queued from 12:55 to 1:35 to meet two princesses. Not a bad way to do it if you ask me!)” Trip Report: Our Mickey-Tastic Adventure - #12 by Cgerres
If you can’t get a FP for TT, then it can’t hurt to try to RD it. Seas with Nemo shouldn’t have a line in the first hour either, so you can head that way too.
World Showcase (other than France, Mexico, and Norway) isn’t open until 11, so I’d start in France, get ice cream, and then wander a bit to see more characters from there. Les Halles in France has a bunch of sandwich options if you want to grab that for lunch. And the ice cream is actually at L’Artisan des Glaces (but it’s right next to Les Halles).