There is a boat that goes across the lake and lands at Morocco, which is between Japan and France, but I think you might be surprised at just how busy the first day of F&G is going to be.
Remember last week as people were reporting on the opening night of DAH, compared to tonight's reports. Last week was mobbed and unorganized. This week is sounds like it ran much smoother. I suspect that could be the case for F&G. You are concerned DN will get bored in WS. I am concerned that EVERYONE is going to become frustrated and cranky with the crowds and possible disorganization.
Just thinking out loud here...
You won't be able to make an ADR until after 1 with your 12:10 FP. So IF you are seated on time, let's say at Coral Reef at 1:10, (I would choose CR over TE. You can get teppanyaki for a lot cheaper at many more places outside of WDW. Its harder to find a giant aquarium to dine next to) meal takes an hour, walk to Mexico, ride the ride, it's now after 2:30. Walk around the showcase, stopping at various places, getting to IG at 3:30. Wait for a boat, ride the boat to HS, go through security, it's now after 4. The calendar as of now is showing F! at 7pm. Even with a FP you still should be there WELL BEFORE 6:30. In this scenario you have maybe 2 1/2 hours to do three major attractions and grab something to eat.
If you were to leave EP right after lunch, walk straight to the IG and head to HS you could expect to be entering the park before 3:00.
Only you can decide what fits your group best.
Whew, that exhausted me just writing it out!