1. That will solve the visa issue if the 59 days visa application hits some obstacle.I am taking Singapore Airlines there. Yeah the fares are high but obtainable with Chase rewards points. I had no idea there was a problem with the airport. S-Passes came through just fine.
2. The airport was damaged by typhoon last Dec.
3. S-Pass is easy. It is the TCP which required to travel into "restricted" area. You can start planning the trip from your S-Pass to see what kind of document needed.