Malyr - It can be hard work - very hard work if you consider the toll on your body at age 50+. Sing is a very decent place to live and recover from that toll but it is getting more expensive by the day. I would strongly suggest a back-up plan if eventually things don't work out as you envision (such as the contractual flight time, bonus....).
Forget about living anywhere but Singapore (or KL) - no EU basing - history
You are a "hired gun" - period
787 - took 7 mos to get an interview, another 8 to get the call - had a week to show up with basically no prior notice - that's just the way they do it. Better have your s**t in one bag and ready to roll if you want a position with SIA - there's plenty in line behind you ready to pounce.