I wouldn’t worry about doing this unless you plan to travel with those disks or have an elevated risk of getting raided/searched.
The (presumed) fact that it’s impossible for someone to prove they forgot some piece of information after being exposed to it is problematic.
This paragraph diverges from your question, about forgetting a password, but something that may or may not work, assuming the story is true, is to assert you never had/remembered the password to begin with, and, assuming you know, explain how the encrypted volumes were created. For instance, you randomly generated the password and then just copy/paste the password when creating an encrypted volume. No guarantees but using technologies that demonstrate inability to comply while maintaining security may prevent/stop torture or jail time thus reduce risk of such violence. One that comes to mind is Cypherlock.
One particularly poignant point made by Smuggler was that, with Cypherlock, privacy is not assured by concealment, but rather by transparency (‘hiding vs. verifiable destruction’). It’s orders of magnitude easier to provably demonstrate that you can no longer access data than it is to convince an adversary that you’re not hiding it in the first place.