Hmm,
sounds like you have the regulatory stuff covered...
Bit hard without more info, which you surely would have been given.
Thinking commercially, I would be looking at fuel management, both in-flight and at total trip planning.
I.e How can you run the numbers to ensure any fuel purchased is at the cheapest possible price.
What are the landing fee's at any given refuel stop etc, and how will that impact the commercial considerations.
For example, on birdsville race weekend, many people head to Leigh Creek on the return journey. The cost of fuel in birdsville is such that it is cheaper to stop at Tibooburra fill, and hopefully only need a splash at birsdville.
Given the info you provided, that's my best guess.