You can get sort of a hidden volume by messing with the alignment of a LUKS partition as well.
However, it may not be very smart to do this. Law enforcement aren't dumb, they'll see the signs of your hidden partition, and you can end up in prison for up to two years for your little stunt.
Unless you're hiding something much more incriminating, cooperation is probably your best bet.
I think the most self-respectful and secure way is to have some encrypted cloud in a jurisdiction which doesn't cooperate with the country you afraid of. Wiping all data from the device and restoring it back after border control.
Hidden partition are definitely more dangerous. Also if these people took your device out of your view point, you need to sell the device and buy a new one before restoring anything.
but this still requires trusting a third party to not change their policies, or to not be hacked or coerced into releasing the data and a myriad other options that a state-backed actor has at their disposal
However, it may not be very smart to do this. Law enforcement aren't dumb, they'll see the signs of your hidden partition, and you can end up in prison for up to two years for your little stunt.
Unless you're hiding something much more incriminating, cooperation is probably your best bet.