I don't think that's possible to do legally. They also don't check how much money you have in your online banking application, right?
What I mean is that they look for how much cash you carry. You can have as much as you want in bank.
And for Bitcoin, that has to be converted into a country's currency to count as funds.
However, let's say you are right and they care about your bitcoins. Do they know what a hardware wallet is? Highly unlikely. But let's say they know. You can enter wrong pin 3 times ("stress because of police") and you recover some other time from the seed. They cannot know if you have 1$ there or billions.
There's totally a very low chance of this happening due to the points you raised, but idk man, I'd personally rather not risk it instead and not bring my personal hardware wallet with me when traveling. Just transfer a decent amount to a mobile wallet and you should be good. Again, though very unlikely, I don't think something like this is outside the realm of possibility.