Considering the same thing myself. What I have come up with so far is this.

Buy in person with cash avoiding kyc.

Self custody 100%.

More small units like gram bars preferred over larger units like oz bars.

My total DCA is income and expenses bound. I plan to adjust the ratio of gold and BTC purchased based on where bitcoin is in the cycle.

Gold is not the only thing of value for prepping for those scenarios. Consider your water, food, and energy sources too. Generating safely onsite beats storage, this applies to all of those resources.