I agree there is not enough gold for an *exclusive* gold standard. But gold makes a superb core for a “precious metals”, or even a “strategic resources” standard.
Take the top 50 to 100 non-volatile, non-renewable strategic resources, and create reserves of them proportional to both their value and their utility. To start, most of them will be elements. But you add to this with precious minerals, ions and isotopes. For example, there are many states of iron with very different properties.
Carbon has almost too many types to label, many of which could be of strategic value, like “Bucky balls”.
This is an interesting concept. Unfortunately, China seems to have cornered the market on rare earths. This will certainly increase the price of gold if it passes. What will it do to the price of silver?? Personal interest in this silver question.