Some of those work, but highly-visible, bulky things are not going to be safe. If they're not outright seized, they'll be taxed to death ... and they know you have them.
Best option is gold coins ... easy to conceal, and easy to redeem for its previous purchasing power when the shizzle hits the fan.
until private possession of gold is going to get forbidden again!
That's a risk, but gold is far more resilient against that threat than the other options. How easy is it for the government to track illegal drug holdings vs. "illegal home holdings"? No, they can ban it, but you can still cash in the gold as easily as you can find your next fix.