You should probably post over on the transportation board to get the official answer from Tyler.
There are busses that start a little after 7 AM. They used to be called character breakfast busses. For Boma's, take the bus for AK and tell the driver you want to go to Boma's and he will either take you there, or call for a bus that will take you from AK to AKL.
I don't know if you go to an early entry park will work too well. They usually don't have scheduled busses that go to resorts from the park that early. Everybody is going from the resorts to the park. You may have to wait a bit for a bus.
Ed