Put your sensitive data on a microSD card and put the card in your mouth while in the checkpoint, the detector won’t be sensitive enough to pick it up (it doesn’t detect fillings and they are around the same size).

If you get in trouble, just swallow.

Or have Veracrypt volumes uploaded to some service and use it from anywhere on the world when need it? Much simpler

Veracrypt is source-available, but proprietary. A better solution would be LUKS-encrypted partitions. For single files, gpg-based encryption should work as well.

And having source available, and most important can be compiled from those sources, means can be scrutinized for vulnerabilities by security experts, yes? That sounds good enough for me.

Security wise, yes. But secure or not, proprietary software can be a turn-off for many.

Or just wipe the HDD and install a fresh OS? I have to admit that I'm uncertain exactly what the goal is.

Github says the goal is to hide your privacy from customs agents. That's the honorable use of this. But is a tool, and just like any tool can be used for both bad or good things. A scammer or spammer will have use of this faster then a person facing customs agents.

A fresh OS is pretty suspicious.

It takes almost no time to reinstall an OS, install a few games from steam.

If you want you don't even need to wipe your install and have a bit more time to spend, you can dual boot and remove the other boot option temporarily from GRUB / MBR or whatever the windows equivalent was.

Or fetch out a few github repos if you don't want to install steam games. :)

I'm not sure I understand your response. Am I missing something in my original comment?

My reply was to say that it's relatively easy to make a clean install not look 'fresh' :P

Fair.

A zeroed drive and a stock OS install, surely unlikely to have any hidden data.