IANAL, but in the US, the 5th amendment still protects combination locks, and as far as I can tell, passwords.
Prosecutors can be as intimidating as they wish, the government is free to use their magical NSA powers to recover the bitcoin. They can't compel someone to incriminate themselves. giving the wallet address to the prosecutor is effectively admitting to a crime, perhaps just conspiracy, but nonetheless that's self incrimination.
They can compel you to enter the passphrase to decrypt your computer so long as there is sufficient evidence that you are capable of doing so.
What they can't do is say "only the person who committed this crime knows the password" and then force you to enter the password (since doing so would be self incrimination). It's when it's already known that you could enter the password that you can be compelled to.
I'm not familiar with the American legal system. Ignoring bitcoin entirely, if you rob a bank and hide the money do you get to keep the money after your release from jail?
Prosecutors can be as intimidating as they wish, the government is free to use their magical NSA powers to recover the bitcoin. They can't compel someone to incriminate themselves. giving the wallet address to the prosecutor is effectively admitting to a crime, perhaps just conspiracy, but nonetheless that's self incrimination.
Go for memorization over tattooing.