Getting the full bank loan for a £75000 course is unsustainable. When you've left university, take away tax and your student loan contribution from the salary and you'll be left with just under 20,000 a year. Flybe will then be taking a futher 4000 a year off that for the interest free loan, that leaves very little free money to be paying off a larger loan.
In my opinion, at most, the best option seems to be to take a maximum of £20000 loan, as well as the flybe £20,000 loan, leaving a further £35000 to be found from elsewhere unfortunately. The flight training schools can help arrange a loan for you at an interest rate of around libor+2% that you start paying after finishing the flight training.
I'd go for the Cathay Pacific scheme for sure, no harm in trying and it's a great trip to Hong Kong if you get past the first stage!