JIV.
You are going to have to clarify some of your points.
1. What are the limitations of P-8?
2. You state that it is fuel hungry. Prove it. You are wrong. A P-8 at Waddington could fly to the Gulf of Oman, go on task for 2 hours and land at Muscat with reserves for masirah intact.
3. In what way would P-8 require complex infrastructure any more or less than other options?
4. It is highly relevant that the P-8 is already operated by RAF aircrew. Especially considering many are in positions of influence and how the USN WiLL be bringing new capabilities online in the future.
If P-8 requires more money to develop it - who do you think will be paying? The US will have to.