Yes, it would be very, very difficult. The most impt. news that would prob. convince NCSBN is if those responsible for the past leakage issue are punished.
The way things are going (nothing) it sends a message that if there will be a testing center here, the old trick of letting reviewees "share" recalled questions and answer options will flourish in Manila as people doing these are left unpunished.
New nurses planning to take NCLEX in the near future might as well just pray for another Int'l testing center in the ASEAN region, such as Singapore or even Bangkok to help alleviate the traffic in the HK testing center.