It looks like the $5 wrench attack came up a few times as well. Easiest way to avoid that would be multisig. Spread those keys across the land. If someone holds you up until you give up your private keys, you can't.
Obviously the best way to mitigate a wrench attack is to maintain your privacy wo you don't become a target, but I've often wondered what the best way to survive it would be provided the attacker has already overcome that first step.
Unless they know for a fact your wallet set up (which is incredibly unlikely), then there is no real difference in using multi-sig and just telling them you are using multi-sig. However, if they are willing to physically attack you for money, is having everything you own locked away in multi-sig wallets really the best way to go? Perhaps you actually want to have some bitcoin available you can hand over for your own sake. Also, there's nothing really stopping them from forcing you to tell them where you've stored all your multi-sig keys instead of the keys themselves.