That's why you use encrypted disk/files with hidden partitions (like VeraCrypt can do). If forced to decrypt you just give the standard password which decrypts to some wallet with only minimal value in it. The hidden partition is impossible to detect/prove and only accessible with the correct second password. When they seize your hardware you still have dozens of backups at home, online, whatever in the same encrypted container.
The "correct" second password mustn't be brute-forced, correct?
Which means it must be a complex one.
Which also means it must be stored somewhere, because otherwise you risk forgetting it.
So you must take the password with you, along with your encrypted disk.
There are significant chances that they will manage to retrieve the password from you and then, they have their ways to make you admit that you have a secret partition.
I 've read all the answers and there are some very fancy ideas, like the t-shirt one.
But! I strongly believe that the best idea is to bring 2-3 books with you and write the 12 words in random pages in these books.