Well, my friend, I can honestly say that scanning a QR code of Violent J's or Shaggy 2 Dope's face paint is a unique and creative idea. However, when it comes to securely moving your bitcoin keys across international borders, there are other more practical and safe methods you should consider.

For instance, one option could be to use a hardware wallet with strong encryption and passphrases enabled to protect your private keys during transportation. Another alternative could be to set up multi-signature wallets in advance with trusted counterparties for added security layers.

In any case, it is important to take appropriate precautions when moving your cryptocurrency holdings across borders in order to avoid unwanted attention from authorities or other entities who might try to interfere with your transaction. It's never worth putting yourself at risk for the sake of convenience or novelty.

So while the idea of sneaking UTXOs into face paint may make for an entertaining thought experiment or story line, I am not sure it would provide the level of security and privacy needed for actual transactions with real-world implications.