We flew with my then 10 month old son from SFO-TPE on a similar schedule. I think the best idea is to try and get them settled at their normal bedtime and really just hope for the best but be prepared for the worst. Unfortunately for my son it didn't work. He was too excited by everything new at the airport and wanted to stay awake for all the excitement. Not even walking him across the terminal in the Ergo (which he normally slept in at that age) worked. So yes, we were those parents boarding with the overtired baby. I think he finally settled a few hours into the flight. Hopefully that doesnt happen to you, but even if it does, you still make it there in one piece more or less