Re: What would be the best way to get through customs at an airport with your Btc?
⭐ Merited by JayJuanGee (1)
Will you also be wearing a "I volunteer for a cavity search" shirt when performing this stunt of human ingenuity? Or are you just going to hope that the security does not notice the guy who has an uncomfortable face when sitting down? 
But beyond that, I think we have covered a lot of ways to do what the OP was looking to do.
Pushing the tech side a bit more, how about running your own node at home with funds and then just using a remote access program to log into it and then sending the funds to your wallet on your phone (or wherever) once you get where you are going. In theory you never went though customs with BTC.
Not really secure since you now have a PC that is online with BTC stored on it with some form of remote access but if you are more concerned with passing through security then about security it's not that bad a concept.
Pushing past that there you can setup a wallet on your phone / device and use a time-lock transaction to send to it. If someone looks at your phone they would see a wallet with nothing in it and then at some time in the future funds would be sent.
-Dave